Homework Help: Math: Trigonometry

Recent Homework Questions About Trigonometry

math/trig
A ship sailed on a bearing 140 degrees. It was then 90 km south of its orignal position. a) draw a diagram to show the ship's journey b) how far east of its original position is it? what ratio would i need? (sine,cosine or tangent) i know that all trig questions have a ...
Thursday, November 26, 2009 at 11:29am

trig
unsure how to find phase shift,vertical shift of y=-2cos(x+3.14/4)+5
Monday, November 23, 2009 at 4:15pm

trig
find all soultions of the equation sec^s x-1=0 in the interval{0,2pi}
Monday, November 23, 2009 at 1:43am

gr 12. advanced functions
Trig identity Prove: cos2x tan(pie/4 - x) ------- = 1 + sin2x
Saturday, November 21, 2009 at 10:40am

Calculus
An airplane flies at an altitude of 5 miles toward a point directly over an observer. The speed of the plane is 600 mi/hr. Find the rate at which the angle of elevation is changing when the angle is 30 degrees. I found the answer to be 60 radians/hr by taking the derivative of...
Thursday, November 19, 2009 at 9:30pm

trig
use sum or difference identities to find the exact value of the trigonometric function: tan 345 please show work, i cant figure out what im doing wrong!
Thursday, November 19, 2009 at 7:38pm

Advanced Functions
Consider the trig equation: 4sinxcos2x + 4cosxsin2x - 1 = 0 in the Interval [0, 2 pi] Either show that there is no solution to the equation in this domain, or determine the smallest possible solution.
Monday, November 16, 2009 at 5:24pm

Trig
How do you do this problem? 1+i(square root of 3)
Thursday, November 12, 2009 at 9:53pm

trig
how do you do sinAcosA=cosA-cos^3A/sinA
Thursday, November 12, 2009 at 7:52pm

trig
when a vehicle is manufactured,its wheels are calibrated to rotate a specific number of times for given speeds with "standard" tires. Suppose a small pickup has standard tires with a radius of 14 inches. You decide to replace those tires with ones which have a radius...
Thursday, November 12, 2009 at 4:10pm

Trig
If sin^2X=A what is an algebraic expression in A for cos(2X). I have no idea where to even begin with this!
Wednesday, November 11, 2009 at 3:32pm

Trig
From a point A on the ground, the angle of elevation to the top of a tall building is 24.1 degrees. From a point B, which is 600 ft closer to the building, the angle of elevation is measured to be 30.2 degrees. Find the height of the building. PLEASE HELP ME!
Wednesday, November 11, 2009 at 12:48pm

trig
This a problem I need help with. A vertical ple stands by a road that is inclined 10 degrees to the horizontal. When the angle of elevation of the sun is 23 degrees, the pole casts a shadow 38 ft long directly downhill along the road. How long is the pole?
Monday, November 9, 2009 at 7:51pm

Trig
I need help with these kind of problems. We are dealing with word problems and/or pictures that are solved by the Law of Sin or Cosine. If any one kows a wonderful web site that can help with these, I would greatly appreciate it. A parollelogram has side lengths 3 and 5, and ...
Monday, November 9, 2009 at 6:12pm

12th grade Trig
sec theta = 2, sin theta is less than 0. I'm not sure what to do? Please explain. Thank you.
Monday, November 9, 2009 at 4:44pm

trig
How do I find the "exact value" for the arcsin of -pi/3 radians?
Sunday, November 8, 2009 at 9:42pm

trig
find the remaining 5 trigometric functions of x cos x = 1/5, x in quadrant 1
Wednesday, November 4, 2009 at 10:10pm

trig
find sin s when cot s= -1/3, s in quadrant 4
Wednesday, November 4, 2009 at 9:48pm

Trig
Find the area of the triangle. b=125 c=162 <B=40 (b and c are the sides) (<B is the angle)
Wednesday, November 4, 2009 at 6:07pm

trig
Prove the following trig identity: 1 + sinx = sinx(1+cscx)
Wednesday, November 4, 2009 at 4:57pm

Trig
How come cosine of 225 degrees is a positive number i thought it was negative because it's reference angle would be 45 degrees below the second quadrant and in a unit circle cosine is just the x value so I thought cosine of something in both the second and third were ...
Tuesday, November 3, 2009 at 8:27pm

Trig
A billboard rests on top of a base. From a point level with the bottom of the base, the angle of elevation of the bottom of the billboard is 26 degrees and the top of the billboard is 31 degrees. From a point 21 meters further away, the angle of elevation to the top of the ...
Tuesday, November 3, 2009 at 6:17pm

Trig
Linear and angular speed Find w for each of the following: 1. the minute hand of a clock 2. the second hand of a clock The answer to #1 should be pi/30, but I do not understand how to solve these.
Monday, November 2, 2009 at 6:58pm

trig
At the winter solstice, the power, in watts, received from the Sun on each square metre of Earth's surface can be modelled by the formula P = 1000sin (x + 113.5 degrees), where x represents the angle of latitude in the northern hemisphere. a) Determine the angle of ...
Monday, November 2, 2009 at 4:19pm

trig
Use a compound angle formula for sine to show that sine2(theta) = 2sine(theta)cos(theta)
Sunday, November 1, 2009 at 6:35pm

trig
Angle x is in the second quadrant and angle y is in the first quadrant such that sinx=5/13 and cosy=3/5. a) Determine an exact value for cosx b) Determine an exact value for siny
Sunday, November 1, 2009 at 6:32pm

trig
Express each value as a trigonomic function of an angle in quadrant I: Cot(-660)
Thursday, October 29, 2009 at 8:49pm

Trig
Determine the quadrant in which each lies: sec0<0,cot0<0 sin0<0,tan0>0
Thursday, October 29, 2009 at 4:31pm

Trig
I need help with these kind of problems! Can someone tell me how to work this problem out? Given tan0=2 square root of 5 over 4, and sin0<0. a. cos0 b. csc0 The 0 after tan, sin, cos, and csc stands for angle. The 0 after the < stands for negative or less than. I know it...
Thursday, October 29, 2009 at 4:23pm

Math Trig
At what two points on the unit circle is the x-coordinate equal to the y-coordinate? Hint:Use the equation for the unit circle (x^2+y^2=1) but this time, replace y with x.
Wednesday, October 28, 2009 at 10:49pm

trig
lx - 2l - lx + 2l > x The absolute value of x - 2 minus the absolute value of x + 2 greater than x. What is the Answer Please Help!
Wednesday, October 28, 2009 at 8:39pm

Calculus (trig stuff)
given a angle how do I find it's point P on the unit circle?
Tuesday, October 27, 2009 at 4:30pm

trig
sin theta/2cos theta/2=1/2 sine theta show the identiy and work
Tuesday, October 27, 2009 at 11:12am

Calculus (trig stuff)
How do I do these type of problems find the exact value. Do not use a calculator cos 7pi
Sunday, October 25, 2009 at 9:33pm

// calculus - trig derivatives
how do i do i do y=cos(radt)+ rad(cost)? ---- f(x) = (3x^2) (csc4x)^4 // f'(x)=? my notes say : f'(x) = (3x^2)5(csc4x)^4(-csc(4x)(tan4x)(4)+(csc4x)^5(6) I redid it and i got : f'(x) = (3x^2)5(csc4x)^4(-csc4x)(cot4x)(4) + (csc4x)^5(6x) which is correct? if ...
Saturday, October 24, 2009 at 6:13pm

Trig
Verify the Identity (sin m +sin n)/ (cos m + cos n) = tan(m + n/2)
Saturday, October 24, 2009 at 3:56pm

Trig
Your school is getting a 10,000 seat stadium to hold spectators for your home football and baseball games. For each row of seats, which rise like stairs, the dimensions are 30 inches wide and 12 inches deep. What is the pitch(angle) by which the rows of seats rise from the ...
Saturday, October 24, 2009 at 12:00pm

Trig
The state highway commission has decided to build a bridge over a dangerous railroad crossing. The approach ramp has to be constructed so that the bridge is 10 meters above the track. If the maximum desired grade of this ramp is 4 degrees, how far back from the edge of the ...
Saturday, October 24, 2009 at 11:58am

Trig
Find the exact circular function value for: sec(23pi/6) I know the answer should be: [2sqrt(3)]/3, but I do not understand how to solve the problem. I have a unit circle, but 23pi/6 is not on it, so I don't know how to find the (x,y)
Thursday, October 22, 2009 at 8:54pm

trig
I need HELP Verify the identity Cot3X/CSCX=cosX(csc2X-1)
Wednesday, October 21, 2009 at 10:08pm

trig
solve sin x-1=0 for 0degress<x<360 degrees
Thursday, October 15, 2009 at 10:23pm

trig
how do you graph y=55-4csc(theta+5)???
Thursday, October 15, 2009 at 10:03pm

Math
I have another question I am stuck on that follows a previous question. How do I get an equation for the height of the car on the ferris wheel over a 10 minute period if we start the analysis one minute into the ride. Can I still use the original formula h = -35cos(2pi*X/5)+37...
Thursday, October 15, 2009 at 2:51am

Math
Hi, this is a question I posted a couple of days ago and answers below.I am still really confused and unfortunately can't copy a picture into this. I thought it would be y-x but have no idea how to calculate that, but as the pistons move in towards each other, wouldn't...
Thursday, October 15, 2009 at 2:46am

trig
Lindsay is out one night and notices that her body casts a shadow that is 1.8m long when she is standing 5mfrom the pole supporting a street light Lindsay is 1.5m tall. 1-what is the angle of elevation to the street light ? 2- how high is the street light
Tuesday, October 13, 2009 at 4:20pm

trig
Joe looks directly north and sees mount Thomas that has an elevation of 2300m above sea level the angle of elevation to mount Thomas from his point of observation is 22 degrees when Joe looks directly east from the same point of observation he sees mount cook the angle of ...
Tuesday, October 13, 2009 at 4:20pm

Maths
I have a trig question regarding a ferris wheel, radius 35m, axles 37m, clockwise direction, rotates twice every 10 mins. I have calculated the following function: h = -35cos(2pi*X/5)+37 I have calculated at what height I would be after 3 minutes by substituting X=3 in the ...
Tuesday, October 13, 2009 at 8:02am

trig
Point P is located at the intersection of a circle with a radius of r and the terminal side of an angle q. Find the coordinates of p to the nearest hundreth. q = -60° , r = 7
Monday, October 12, 2009 at 7:40pm

Trig
This problem is stumping me, can anyone help me? The Earth rotates every 24 hours (actually 23 hours, 56 minutes and 4 seconds) and has a diameter of 7926 miles. If you're standing on the equator, how fast are you traveling (how fast is the Earth spinning)? Compute this (a...
Sunday, October 4, 2009 at 9:57pm

Trig
Need hellpp!! If a bicycle has 26 inch diameter wheels and the front “chain”drive has a radius of 2.1 inches and the back drive has a radius of 2.5 inches, how far does the bicycle travel for every one rotation of the cranks (pedals)? Carry out all calculations ...
Sunday, October 4, 2009 at 8:56pm

trig
I need help on these problems: Find the exact value of tan(23pi/6) also, Find the reference angle in radians and degrees for (34pi/18) please help walk me through these.
Sunday, October 4, 2009 at 8:17pm

trig
csc(x)=3 and pi/2 less than (x) less than 3pi/2, find cot(x).
Sunday, October 4, 2009 at 6:18pm

Trig
A line goes through points (2ã3,-3) and (8ã3,3). Find the equation of the line through these 2 points and the angle of incline (between the line and the x-axis).
Sunday, October 4, 2009 at 5:29pm

Trig
A 30 degree central angle is in central position in a circle with a radius of 7 square roots of 5 (245). What are the coordinates of the point where the terminal ray intersects the cicrle?
Sunday, October 4, 2009 at 3:56pm

algebra 2 trig
i need to find out how to solve this problem: 9x+2 7 ---------- + --- 3x^2-2x-8 3x^2+x-4
Sunday, September 27, 2009 at 5:26pm

precal
can anyone help me with this question. Let P be the point on the unit circle U that corresponds to t. Find the coordinates of P and the exact values of the trig functions of t, whenever possible. (a) -pi (b) 6pi
Wednesday, September 23, 2009 at 2:37pm

Physics
An object is shot at 20m/s at an angle theta. The object lands 24m away. What is the angle? Can you check if I am doing this right? I had v(initial) = 20 m/s g = 9.8 m/s^2 x = 24m 1st I solved for time: x = v(initial) t x = v(initial) cos(theta) t 24 = 20 cos(theta) t 24 / [20...
Tuesday, September 22, 2009 at 10:02am

Math - Trig
I'm trying to verify these trigonometric identities. 1. 1 / [sec(x) * tan(x)] = csc(x) - sin(x) 2. csc(x) - sin(x) = cos(x) * cot(x) 3. 1/tan(x) + 1/cot(x) = tan(x) + cot(x) 4. csc(-x)/sec(-x) = -cot(x)
Monday, September 21, 2009 at 8:42pm

Pre Calc Trig Bit
Determine whether the given information resutls in one triangle, two triangles, or no triangle at all. Solve any triangle(s) that results. b = 4 c = 6 beta = 20 Ok... I checked my answers in the back of the book and got the first triangle right Gamma = 30.9 alpha = 129.1 a = 9...
Sunday, September 20, 2009 at 8:28pm

Physics (Trig Bit)
A boy and a girl carry a 12.0 kg bucket of water by holding the ends of a rope with the bucket attached at the middle. FI tehre is an angle of 100.0 degrees between the two segments of the rope, what is the tension in each part? I do not understand the work Fw = mg = (12.0 kg...
Saturday, September 19, 2009 at 8:17pm

trig
I'm trying to see if the teacher didn't give us the right problem or if I'm just not getting it. The problem is "re-write the expression without a fraction: 4/(1-sin x)". I can do it if the problem is sin squared x but I don't know how to solve the ...
Saturday, September 19, 2009 at 5:30pm

Trig
Does anybody know a good website that will hlp me with finding the six trig functions of a point NOT on the unit cricle?
Wednesday, September 16, 2009 at 7:59pm

Trig
Help with solving radical fractions.
Tuesday, September 15, 2009 at 8:05pm

TRIG
please help two questions h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 5 2 9 6 7 1 5 7 also A surveillance satellite circles Earht at a height of h miles above the surface. Suppose that d is the distance, in miles, on the sruface of Earth that ...
Monday, September 14, 2009 at 7:08pm

trig please
I have no idea how to do this Find the value of the angle theta in degrees rounded to the neartest tenth of a degree. I have no idea were to start... h t t p : / / i m g 6 . i m a g e s h a c k . u s / i m g 6 / 5 8 9 9 / a d s f a s d f a s d f a d s f s a d f . j p g
Monday, September 14, 2009 at 6:25pm

Trig Picture
maybe i drew it wrong... h t t p : / / i 3 2 . t i n y p i c . c o m / i p m k o 5 . j p g the way my teacher taught me the angle of depression was the anlge that is made with a horizontal line or something like that i believed i drew it right oh and by the way this is the ...
Friday, September 11, 2009 at 6:16pm

Trig
I have no idea how to do this problem From an airplane flying 2 kilometers aboce the ocean, a piolet sees two ships directly to the east. The angles of depression to the ships are 8 degrees 20 minutes and 75 degrees 40 minutes how far away are the ships? I know what the anlge ...
Friday, September 11, 2009 at 4:36pm

trig
Given that sin^2ceta/1-cos ceta -sin^2ceta/1+cosceta=1 where 0degress is less than or equal to ceta and less than or equal to 360 degress. find the value of ceta
Friday, September 11, 2009 at 11:45am

Trig
Two observers 1 km apart spot an airplane. The angles of elevation of the airplane from the two observers are 22 degrees 50 minutes and 24 degrees 40 minutes. If the observers and the airplane are in the some vertical plnae, compute the altitude of the airplane. ok i don\'...
Thursday, September 10, 2009 at 5:29pm

math algebre2 and trig
5>4b+9>17 - -
Wednesday, September 9, 2009 at 5:29pm

trig
h t t p : / / i m g 4 0 . i m a g e s h a c k . u s / c o n t e n t . p h p ? p a g e = d o n e& l = i m g 4 0 / 1 4 8 / a s d a s d y e . j p g & v i a = m u p l o a d (def of tan theta = a^-1 o)a = o opposite = adjacent tan theta written with respect to the first angle ...
Sunday, September 6, 2009 at 5:06pm

Trig Math
Solve the equation algebraically for x wohere 0 </ x< 2 pi. sin2 x = cos x
Thursday, September 3, 2009 at 3:20pm

Trig
Special Angles And their Measures Fill out the Table Below: in degrees Sin Cos Tan 0 30 45 60 90 120 135 150 180 210 225 240 270 300 315 330
Monday, August 31, 2009 at 5:30pm

algebra/trig
simplify using properties of exponents ? (2y^1/5)^4 ---------- y^3/10 what would that be please hlepp
Monday, August 31, 2009 at 4:53pm

trig
Find cos(a=b). sin a = 3/5, a lies in Quadrant II, and cos b = 5/13, b lies in Quadrant I.
Sunday, August 30, 2009 at 10:03pm

Trig
h t t p : / / m a t h c e n t r a l . u r e g i n a . c a / Q Q / d a t a b a s e / Q Q . 0 9 . 9 9 / a n g e l a 2 . 2 . g i f give that picture how do I solve for (h) I know that you you From the diagram tan(3.5) = h/(13 + x) and tan(9) = h/x. Solve the second equation for x...
Thursday, August 27, 2009 at 7:36pm

Trig Identities
If tan(theta)=7/13 and cos(theta)<0, what is the exact value of sin(theta)?
Monday, August 24, 2009 at 2:27pm

Trig....
use specific triangles and the unit circle to geth the values. tan(5pi/6?)
Sunday, August 23, 2009 at 10:37pm

Trig Function Question
The y-intercept of the function g(x)=2sin2pi(x-1)+1 is what?
Thursday, August 20, 2009 at 1:32pm

trig
hoW to evaluate these if cos=-12/13, A in Q II and cot B =5/12, B in Q III A) Sin^2 A (the sign ^ is power of)
Monday, August 17, 2009 at 10:29am

Math Trig
As the time changes from 4:10 pm to 6:45 pm on the analog clock, determine the change in radian measure of the minute hand.
Sunday, August 16, 2009 at 3:44pm

Trig problems
Part 1) Evaluate tan 7.5 Part 2) Evaluate exactly cos (-(45pi(4)))
Friday, August 14, 2009 at 9:16pm

Trig problem
What is a coterminal angle with 170 degrees?
Friday, August 14, 2009 at 2:01pm

trig
ok I'm trying to solve for an angle knowing adjacent and opposite of a triangle so I do tangent by definition tan theta = a^-1 o how do I algebraically solve for theta
Thursday, July 30, 2009 at 1:57pm

trig
how do you find the limits of : lim sinx/x where x->0 and lim 1/x-3 where x-> 3
Saturday, July 25, 2009 at 9:33pm

trig
how can i find all the exact solutions to the equation : 2cos^2x + 3sinx = 3 the solutions have to be between [0,2pi)
Saturday, July 18, 2009 at 11:10pm

trig
I have to solve for side B of a right triangle. Side A is the square root of (25-x^2) and the hypotenuse is 5. when i do A^2 + B^2 = C^2 then at the end i end up with b^2 = -x^2 but the square root of a negative number is not possible so what am i doing wrong?
Saturday, July 18, 2009 at 9:14pm

trig
how can you confirm the identity cos^4x = (1/8)(3+ 4cos2x+ cos4x) and sin4x = (4sinxcosx)(2cos^2x-1)
Saturday, July 18, 2009 at 1:20am

trig
I need to find all solutions of the given equations for the indicated interval. Round solutions to three decimal places if necessary. 1.) 3sin(x)+1=0, x within [0,2pi) 2.) 2sin(sq'd)(x)+cos(x)-1=0, x within R 3.) 4sin(sq'd)(x)-4sin(x)-1=0, x within R 4.) sin(x)+1=cos(x...
Sunday, June 21, 2009 at 8:55pm

University math grade 11 Trig
A very tall light standard is swaying in an east-west direction in a strong wind. An observer notes that the time difference between the vertical position and the furthest point of sway was 2 seconds. The pole is 40 metres tall. At the furthest point of sway, the top of the ...
Saturday, June 20, 2009 at 9:14pm

Math
Trig Identity Prove: cos(x+y)cos(x-y)=cos^2(x)+cos^2(y)-1
Thursday, June 18, 2009 at 9:20pm

Math
Required to Prove the following trig identity: (cos2x)^2 + (sin2x)^2 = 1
Thursday, June 18, 2009 at 4:45pm

trig
Is the answer to this problem correct? I'm not sure and I want to make sure I do well on the test. Evaluate the following logarithms given log 4/log a = .321 The answer my teacher gave me was 0.963. What is the reasoning behind the answer?
Wednesday, June 17, 2009 at 12:28am

trig
It's in sigma notation, so I'm not sure how to type it. I'll just use E lol. Find each sum. 6 E (n+1)/(n+2) n=1 Is this a geometric or arithmetic series? That is pretty much all I really need to know. I appreciate all the help you guys give.
Tuesday, June 16, 2009 at 11:19pm

trig
Solve for X. Leave answers in logarithmic forms. 3^(2-x) = 2^x Thanks.
Tuesday, June 16, 2009 at 6:22pm

trig
The expression 4 sin x cos x is equivalent to which of the following? (Note: sin (x+y) = sin x cos y + cos x sin y) F. 2 sin 2x G. 2 cos 2x H. 2 sin 4x J. 8 sin 2x K. 8 cos 2x Can someone please explain how to do this problem to me?
Friday, June 12, 2009 at 1:00am

trig
I have no idea how to solve this problem. <A is in standard position on a unit circle. Point P (-1/2, -√3/2) is the point of intersection of its terminal side with the unit circle. Find the measure of <A in radians.
Wednesday, June 10, 2009 at 7:30pm

math -trig
a concrete border is to be built around a traingular flower garden that has sides of 10m , 7m and 8m. the border is to be staight walking path 1m wide on all sides of the garden. before the concrete can be poured, wooden forms need to be placed on the inside perimeter and on ...
Tuesday, June 9, 2009 at 8:19pm

math-trig
a concrete border is to be built around a traingular flower garden that has sides of 10m , 7m and 8m. the border is to be staight walking path 1m wide on all sides of the garden. before the concrete can be poured, wooden forms need to be placed on the inside perimeter and on ...
Tuesday, June 9, 2009 at 7:58pm

trig
Find arcsin [cos (Pi/2)] The answer is 0. How do you solve this problem? Thanks.
Monday, June 8, 2009 at 8:42pm

Alg2/Trig
Find the exact value of the trigonometric function given that sin u = 5/13 and cos v = -3/5. (Both u and v are in Quadrant II.) Find csc(u-v). First of all, I drew the triangles of u and v. Also, I know the formula of sin(u-v) is sin u * cos v - cos u * sin v. However, I am ...
Thursday, June 4, 2009 at 11:23pm

College Preparation
I'm trying to major in history or journalism. Should I take trigonometry, or do you think that's not needed? I know it varies from school to school, but overall, do you think I'll be fine without trig?
Tuesday, June 2, 2009 at 10:24pm

trig
sorry the first one I put in had a typo cosx/1-tanx + sinx/1-cotx = sinx +cosx
Tuesday, June 2, 2009 at 6:30pm

trig
cosx/1-tanx + sinx/1-cotx = sinx =cosx
Tuesday, June 2, 2009 at 6:26pm

Trig
The angle 2x lies in the fourth quadrant such that cos2x=8/17. 1.Which quadrant contains angle x? 2. Determine an exact value for cosx 3. What is the measure of x in radians? ---------------- I know that quadrant 4 has 2x in it, so quadrant _____ has to have x ? for part 2, ...
Sunday, May 31, 2009 at 1:24pm

Trig
The angle 2x lies in the fourth quadrant such that cos2x=8/17. 1.Which quadrant contains angle x? 2. What is the measure of x, in radians? ---------------- I know that angle 2x is in quadrant 4, but quadrant x...? I am not sure where it is and how to get the measure of it in ...
Sunday, May 31, 2009 at 12:05pm

trig
I need to know how to graph y = sin 2(x - Pi/3) I need to have: Amplitude Period Phase Shift 5 critical points Help would be appreciated. Thanks.
Thursday, May 28, 2009 at 7:17pm

Grade 11 Algebra 2/Trig
Given : f(x) = x^2 and g(x) = 2^x The inverse of g is a function, but the inverse of f is not a function. Explain why the statement is true.
Wednesday, May 27, 2009 at 6:47pm

11th grade Algebra 2/ Trig
The expression log 10^(x+2)- log 10^x is equivalent to???
Wednesday, May 20, 2009 at 8:05pm

trig
I do not understand for my life how to solve this problem. Evaluate the expression without the aid of a calculator. arccos[(-3^1/2)/2) I'm not sure how my teacher did it. I know she said to find which quadrant that cos can be in and graph the triangle to find the angle.
Monday, May 18, 2009 at 8:34pm

senior year
does anyone know what consumer math is? i'm trying to take it for my senior year, but i'm not sure what it's about. or if i can take it after trig and algebra.
Sunday, May 17, 2009 at 3:32pm

MATH TRIG
FROM A DISTANCE OF 80 M. THE ANGLE OF ELEVATION OF THE TOP OF A FLAGPOLE IS 18 DEGREES. dETERMINE THE HEIGHT OF THE FLAGPOLE.(NEAREST TETH OF A M. mY CONFUSION IS ANGLE OF DEPRESSION AND ANGLE OF ELEVATION. mY TECHER CALLS FROM TOP ELEVATION WHILE i INSIST ELEVATION IS FROM ...
Wednesday, May 13, 2009 at 9:27pm

Physics
so I'm doing the back of this worksheet and on the bottom there's a list of a whole bunch of formulas... I'm asked to find the minimum coefficent of friction if the road was flat of a car which I still don't know how to do and posted a question about it below ...
Monday, May 11, 2009 at 7:59pm

Trig
give the missing value: sin 54.2=? -->i think its 0.811 but i might be wrong. sec 23.2=? --->i think its 1.08, but again, i could be wrong and i have NO idea how to do these: cot ? =-0.500 sec ?= 1.000 csc ?= 0.732
Sunday, May 10, 2009 at 8:54pm

Anonymous
Give the exact intersection point for the equations f(x)=4sin^2x+7sinx+6 and g(x)=2cos^2x-4sinx+11 Ok, my result is that there is no intersection point because if you put f(x)=g(x) and try to solve for x or the intersection point, the LS f(x) is not possible, so there is none...
Friday, May 8, 2009 at 2:54pm

trig
The terminal side of an angle includes the point (5,-12). Give the sine, cosine, and tangent of the angle exactly. I know how to plot it and everything, but I'm not sure where to put theta so I know which angle to use for finding sine, cosine, and tangent. I think it has ...
Thursday, May 7, 2009 at 8:52pm

Ske
If Shella has a pulse rate of 73 beats per minute and a blood pressure of 121 over 85 and this can be modeled by a sinusoidal function, find this equation. Could you explain to me how to do this step please by showing me the steps? Thanks
Thursday, May 7, 2009 at 7:23pm

Anonymous
study of sunspots. spots in a year min. is 10, max is 110. between max's of 1750 & 1948, 18 cycles occurred. Find a sinusoidal equation to model this. My equation looks something like this so far: y=50sin(2pi/11(x-d))+60 so How do I get the phase shift? d? I am confused ...
Thursday, May 7, 2009 at 5:46pm

trig
The average depth of water at the end of a dock is 6 ft. This varies 2 ft in both directions with the ride. Suppose there is a high tide at 4 am. If the tide goes from low to high every 6 hours, write a cosine function describing the depth of the water as a function of time ...
Monday, May 4, 2009 at 8:31pm

trig
A city averages 14 hours of daylight in June, 10 in December, 12 in both March and September. Assume that the number of hours of daylight varies sinusoidally over a period of one year. Write an expression for n, the number of hours of daylight, as a cosine function of t. Let t...
Monday, May 4, 2009 at 8:28pm

trig
Scientists believe that the average temperature at various places on Earth vary from cooler to warmer over thousands of years of gradual climate change. Suppose that at one place, the highest avg temp is 80 and the lowest is 60. Also suppose that the time it takes to go from ...
Monday, May 4, 2009 at 7:21pm

math
how would you solve for x: (3)^.5sin(2x)-2cos(2x)+2sin^2(x)=1 using trig identites. please help
Sunday, May 3, 2009 at 9:11pm

math
how would you find the angle to (3)^.5sin(2x)-2cos(2x)+2sin^2(x)=1 I know that you have to use the trig identities but then when i substitue the sin and cos(2x) in i don't know what to do. please help
Sunday, May 3, 2009 at 8:01pm

trig
prove the following trig identity: a) sin(pi/6 + x) + sin (pi/3 + x) + sin (pi/2 + x) = ((sqrt3) +1)/2 (sinx +(sqrt3)cosx) b) sin(pi/4 + x) + sin(pi/4 - 4)= (sqrt2)cosx
Sunday, May 3, 2009 at 11:31am

trig
2cosx+sinx+1=0 how do I get everything in one function?
Friday, May 1, 2009 at 4:45pm

trig
I am very confused about the concepts of.. sin è = sin(180 - è) sin (180 + è)= -sinè tan (180 - è) = -tanè and how the final answer was found in this problem... Find cos 510: cos510=cos(540-30) =-cos30 =-s.r3/2 i dont understand how we...
Thursday, April 30, 2009 at 7:01pm

trig
Give the measure of the acute angle with each given value to the nearest tenth of a degree. cos A = 0.1 (84.3 degrees) sec D = 1.8 (65.3 degrees) That is all it gives :( How would I go about solving this?
Wednesday, April 29, 2009 at 8:27pm

Alg 2/trig
I have the answers to the question, but I have no on how to get the answers. State the quadrant in which theta lies. Cos X < 0 and Sin X > 0 (Answer is 2) Tan X < 0 and Sin X < 0 (Answer is 4) Cos X > 0 and Tan X > 0 (Answer is 1) Cot X < 0 and Sec X < ...
Wednesday, April 29, 2009 at 7:17pm

senior courses
So far in high school i have taken geometry, algebra 2, and trigonometry. one of my friends is taking calculus and she says its way too difficult. and since i have alot of trouble in algebra and trig myself i dont think calculus would be the right choice for me next year. what...
Tuesday, April 28, 2009 at 10:05pm

trig
I do not understand these problems. :S I'd really appreciate the help. Use trigonometric identities to transform the left side of the equation into the right side. cot O sin O = cos O sin^2 O - cos^2O = 2sin^2 O -1 (tan O + cot O)/tan O = csc^2 O
Monday, April 27, 2009 at 9:11pm

Trig Proofs
Please solve this proof Tan(pi/4 +x)+ Tan(pi/4+x)= 2Sec2x
Monday, April 27, 2009 at 8:34pm

Trig Proofs
Please Help: please solve this proof: cosx- cosy = -2sin(x+y/2)sin(x-y/2)
Monday, April 27, 2009 at 8:27pm

trig
determine the solutions for tanxcos^2x-tanx=0 in the interval XE[-2pi,2pi] Ok, please describe the steps to me that you used to solve this! thank you
Monday, April 27, 2009 at 6:19pm

trig
the voltage, v, in volts, applied to an electric circuit can be modelled by the equation v=167sin(120pi)(t), where t is the time, in seconds. A component in the circuit can safely withstand a voltage of more than 120 V for 0.01 sec or less. a) determine the length of the time ...
Monday, April 27, 2009 at 6:16pm

trig
determine the exact value for sin[cos^-1(4/5)] if XE [0,2pi]
Monday, April 27, 2009 at 6:06pm

trig
1. Write a sinusoidal function for the function with a period of 6. The function has a max of 3 at x=2 and a low point of -1. 2. Write a sinusoidal function for the function with a period of 5. The function has a max of 7 at x=1. explain it in full detail please
Sunday, April 26, 2009 at 6:02pm

trig
I have finished the questions for the following, but could someone please check to see if my answers are right because there are no answers for these questions since it's a sheet that my teacher gave us. Ok, just let me know where my errors are and what is the correct ...
Sunday, April 26, 2009 at 5:18pm

trig
verify that f(x)= -2x+4 and g(x)= -1/2x+2 .....HELP! i totally blanked on this one :(
Wednesday, April 22, 2009 at 10:56pm

Trig
sin(70°)cos(10°) − cos(70°)sin(10°)
Wednesday, April 22, 2009 at 1:43am

trig--power reducing formulas
Having trouble with this problem: Rewrite the expression as an equivalent expression that does not contain powers greater than 1. Cos³x My answer: cos³x=(cos²x)(cosx) =(1+cos2x/2)(cosx)-->cos+cos³x/2...which is wrong
Monday, April 20, 2009 at 1:56pm

trig proof
Help anyone? I need both sides to equal. -2sinxcosx/ 1-sinx-cosx = 1+sinx+cosx
Sunday, April 19, 2009 at 10:29pm

Trig
solve sin(2 theta)< cos( theta)
Sunday, April 19, 2009 at 5:22pm

Trig
Using a double angle formula how would you find the exact value of this expression? Cos²105° - sin²105°
Sunday, April 19, 2009 at 2:51pm

trig
1/sinx = sinx+cosxcotx it's a proof and I have to make them equal to each other. Please help!
Sunday, April 19, 2009 at 11:44am

Trig--check answer
Solve the equation of the interval (0, 2pi) cosx=sinx I squared both sides to get :cos²x=sin²x Then using tri indentites I came up with cos²x=1-cos²x Ended up with 2cos²x=1 Would the answer be cos²x=1/2???
Wednesday, April 15, 2009 at 4:40pm

Math-Trig
1. Create an algebraic expression for sin(arccosx-arcsin3x) 2. The cosx=4/5, x lies in quadrant 4. Find sin x/2 3.Determine all solutions in (0,2pie) for sin4xsin^2x=3, cot^2v(3-1)cotx=v(3), cos^2x=cosx, and tan^2x-6tanx+4=0 4. Solve; sin(∏/2-x)=1/sec 5. Solve; cot+4x+...
Tuesday, April 14, 2009 at 9:20pm

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