Thursday
May 23, 2013

# Homework Help: Math: Trigonometry

trig.
in an algebra class of 21 students the mean grade on a test was 87; in another class with 32 students the mean grade was 81. What is the combined mean of the two classed? my teacher said it's 21 * 87 + 32 * 81/53= 83.4 but i'm not sure where the 53 came from.. thanks ...
Monday, September 8, 2008 at 8:24pm

Math - Trig Substitution
How can I solve the integral of x^3√(9-x^2) dx using trigonometric substitution? ? ∫ x^3√(9-x^2) dx So then I know that x = 3sinθ dx = 3cosθdθ When I substitute, it becomes ∫ (3sinθ)^3 * √(9-(3sinθ)^2) * 3cosθdθ...
Monday, September 8, 2008 at 3:55am

Trig/Pre-Cal
Show that the distance between the points (x,y) and the line Ax + By + C = 0 is: D = (Ax + By + C) / sqrt(A^2 + B^2) So, would you start out by multiplying sqrt (A^2 + B^2) to both sides and then it would become: sqrt (A^2 + B^2)D = Ax + By + C Then square both sides, D^2(A^2...
Sunday, September 7, 2008 at 11:18pm

Trig
How do you find an equation of a line perpendicular to y=x at the point (5,5) in standard form?
Sunday, September 7, 2008 at 5:44pm

trig
The number of revolutions made by a figure skater for each type of axel jump is given. Determine the measure of the angle generated as the skater performs each jump. Give the answer in both degrees and radians. a. single axel: 1.5 b. double axel: 2.5 c. triple axel: 3.5
Saturday, September 6, 2008 at 9:38pm

trig
if a and b are acute angels and sin(a+b)=1,sin(a-b)=1/2 then prove that (1)tan(a+2b)=-(3)1/2
Saturday, September 6, 2008 at 11:04am

trig
if p and q satisfy the equation atanx+bsecx=c then prove tan(p+q)=2ac/a2-c2
Friday, September 5, 2008 at 9:23am

trig
Prove the identity. (must work with left side) (1-2sin(x)^2)=(cos(x)^2)
Thursday, September 4, 2008 at 10:29pm

Math integral
What is the integral of 1/(x√(x^2-4)) dx? So I know that I am going to have to factor out the 4 and use the arcsec trig identity but I've having trouble getting to a viable u-substitution. I've gotten to factoring like this so far: √(x^2-4) = √[2^2(x^...
Wednesday, September 3, 2008 at 7:10am

Trig
The depth of water in a tank oscilliates sinusoidally once every 6 hours. If the smallest depth is 5.5 feet and the largest depth is 8.5 feet, find a possible formula for the depth of time inhours. I say f(x)=6.75+1.25sin(pi/3) Am I right
Friday, August 29, 2008 at 10:19am

trig
Is this formula continous on the interval (-1,1) h(theta)=(theta)sin(theta) How do you enter theta into the calculator to graph the function. Also, am I suppose to plug in the numbers into the function to determine if it is continous
Friday, August 29, 2008 at 9:57am

Trig
Is this formula continous on the interval (-1,1) h(theta)=(theta)sin(theta) I say no, but could some one explain the process involved in determining this.
Friday, August 29, 2008 at 2:00am

Geometry
x ________________<20* |<90* y | |<70* (hypotenuse length is 12 units) I'm learning about trig ratios, and my dad was trying to compare it to a circle or something? All I know is sin = a/c cos = b/c tan = a/b you're trying to figure out the proportions of the...
Saturday, August 23, 2008 at 12:06pm

trig
tan=.6524 use a calculator to approximate two value of an angle (0<0<360) that satisfy the equation.
Monday, August 18, 2008 at 8:34pm

trig
Can you please help me w/ this?? The range of the function y=tan pi x is abs(y) > (greater than or equal to) A The value of A is (a) 0 (b)2 (c)- infinity (d)+ infinity (e) none of these
Friday, August 8, 2008 at 7:20pm

Algebra II/Trig
Simplify: (n/4)/(n/m) As my answer I got: 4m Is this response correct? If not, please let me know what I did wrong.
Thursday, August 7, 2008 at 6:52pm

Algebra II/Trig
Simplify: 1/5(-5a^2b^3)^2(abc)^4 How do you simplify this. How does the "-5" play a role in this? how would you get 1/5 of "-5"
Thursday, July 31, 2008 at 2:18pm

math
Prove the following identities: a) (cosec θ + cotθ)(cosecθ - cotθ) = cotθtanθ b) 2/(1 + sinθ) + 1/(1- sinθ) = (3sec^2)θ - tanθcosecθ I basically just have to prove Left HandSide = Right Hand Side
Friday, July 18, 2008 at 12:04pm

trig
establish the identity: cot(A-B)= cotAcotB+1/cotB-cotA thanks for any help at all
Wednesday, July 16, 2008 at 6:35pm

trig/pre -calc
hello, i don't quite understand how to do this type of problem: 1. find the exact value of sin (pi/3). even more confusing is 2. find the exact value of csc^-1 (1). i would appreciate any kind of help! thank you!
Monday, July 14, 2008 at 10:09pm

trig
a state trooper is hidden 30ft. from a highway. One second after a truck passes, the angle beta between the highway and the line of ovservation from the patrol car to the the truck is measured. if the speed limit is 55mph and a speeding ticket is issued for speeds of 5mph or ...
Tuesday, July 8, 2008 at 10:08pm

trig
how would you verify this trig identity (1+cos(x) / 1-cos(x)) - (1-cos(x) / 1+cos(x)) = 4cot(x)csc(x) ? help please!
Wednesday, June 25, 2008 at 5:25pm

trig
simplifying trigonometric expression a) sinx/tanx cosx b)sin^4a + sin^2a cos^2a c)sin0-sin0cos^2+ / sin^20 could someone help me with these?? thank you
Tuesday, June 17, 2008 at 3:29pm

trig
Because of prevailing winds, a tree grew so that it was leaning 4 degrees from the vertical. At a point, 35 meters from the tree, the angle of elevation to the top of the tree is 23 degrees. Find the height h of the tree
Tuesday, June 10, 2008 at 2:36am

trig
solve log(x +9) - log x=3
Monday, June 9, 2008 at 11:22pm

trig
How do you find all the solutions of the equation in the interval [0,2π)? 3tan^3x=tanx
Monday, June 9, 2008 at 11:05pm

trig
write an algebraic equation equivalent to csc(arctanx)
Monday, June 9, 2008 at 7:44pm

trig
solve 2sin^2x+sinx-1=0 in the interval [0, 2pi0
Monday, June 9, 2008 at 5:58pm

How would you solve tan(-335) without using a calculator? I got it to tan(25) but that's not one of the ones on our chart, and I'd use a sum or difference identity but we never learned one for tangent, if one exists.
Tuesday, June 3, 2008 at 9:12pm

trig
Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help sin (-pi/12)
Monday, June 2, 2008 at 9:20pm

trig
The equation f(x) = 3x^3 + 10x^2 - 16x - 32 has a root at x = -4 a) Find the depressed equation using synthetic division and the root given. Factor out any constants that may appear. b) Factor the depressed equation (which is now a quadratic) using any method EXCEPT synthetic ...
Monday, June 2, 2008 at 9:19pm

trig
Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help cos (-5pi/12)
Monday, June 2, 2008 at 9:18pm

trig
Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help cos (7pi/12)
Monday, June 2, 2008 at 9:18pm

trig
Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help cos (4pi/3 – 3pi/4)
Monday, June 2, 2008 at 9:17pm

Trig
Find all x and y between 0 and 2pi so that the equation is ture -2 cosx -i sin y = 2 sinx +i i am also having trouble with this one Simplify the power of i i to the 39th power
Friday, May 30, 2008 at 5:54pm

trig
how does this work? (Sin2x+cos2x+2sin²x)/(sinx+cosx) = (sinx+cosx
Thursday, May 29, 2008 at 5:58pm

trig
find the value of : sin18'
Wednesday, May 28, 2008 at 9:38pm

trig
If A+B+C=^(^=180) prove that sinA + sinB - sinC = 4sinA/2 sinB/2 cosC/2
Wednesday, May 28, 2008 at 9:28pm

trig
x^2-3y^2=13 x-2y=1 solve for x and y show all your work
Wednesday, May 28, 2008 at 5:35pm

Trig #1
i dont know how to search for this question can somebody help plzz question is : List as many jobs as you that use trigonometry. net find out what specific training is necessary to be hired for eac job. This is to include the name of the major, the name of the degrees earned, ...
Wednesday, May 28, 2008 at 1:08am

physics
i understand that i posted questions like crazy but you have to understand i do try them out i use this website as a last resort and mainly to see what you think i should do. there are still a few i can't get. An object whose height is 3.5 cm is at a distance of 8.5 cm ...
Monday, May 26, 2008 at 11:56pm

trig
using the unit circle evaluate cos and sin for 30
Saturday, May 24, 2008 at 2:43am

trig
Solve for the unknown. Assume that all of the angles are acute. 1. U = 69 A = 75 AN = 56 NU = ______ is this right NU= 92.05
Tuesday, May 20, 2008 at 10:30pm

trig
sketch one cycle of y=-3 sin 0 i know you guys wouldnt be able to draw it for me on here, but is this able to do on a graphing calculator, or could u explain the steps needed to do this problem? thanks in advance
Monday, May 19, 2008 at 9:37pm

trig
Write the measure in radians. Express the answer in terms of ð -260°
Monday, May 19, 2008 at 6:58pm

trig
Find the exact value of cot 45°, if the expression is undefined write undefined.
Monday, May 19, 2008 at 6:32pm

Trig
Two planes leave an airport at the same time, one flying at 300 km/h and the other at 420 km/h The angle between their flight paths is 75 degrees. Aftar three hours, how far apart are they ? i guss i have to use the equation D= b.h but i cant fit the number in spot can u ...
Saturday, May 17, 2008 at 12:40pm

trig
Quadrant I tan terminal= 2 what is csc terminal
Friday, May 16, 2008 at 9:49pm

trig
find the exact value for each function tan pi/3 cos pi/4
Friday, May 16, 2008 at 5:08pm

simplyfying expressions (trig)
can anyone tell me how to do this? thanks! (sin (x) / 1 + cos (x) ) + ( cot (x) / 1 + cos (x) )
Friday, May 9, 2008 at 5:42pm

trig
1. 3cot^2 (x) - 1 = 0 My answer: pi/3, 2pi/3, 4pi/3, 5pi/3 2. 4cos^2 (x) - 1 = 0 My answer: pi/3, 2pi/3, 5pi/3, 4pi/3 3. 2sin (x) + csc (x) = 0 My answer: unknown lol i got to the part: sin^2 (x) = -1/2 4. 4sin^3 (x) + 2sin^2 (x) - 2sin^2 (x) = 1
Friday, May 9, 2008 at 4:50pm

trig
how do you solve cot theta divided by csc theta is equal to cos theta?
Friday, May 9, 2008 at 10:52am

trig
Simplify (tan^2θcsc^2θ-1)/(tan^2θ)​ This question totally stumps me. I know that csc^2=1/(sin^2) and tan^2=(sin^2)/(cos^2), but I don't see how I can use these identities to simplify the question. What am I missing? Help is much appreciated!
Thursday, May 8, 2008 at 5:49pm

Trig
Find sec theta if sin theta = -4/5 and 270 degrees < theta < 360 degrees.
Monday, May 5, 2008 at 8:23pm

Trig
What is sin^2 - cos^2 x/ 1-2cos^2 x, using the identities.
Sunday, May 4, 2008 at 10:52pm

trig
solve for x 6tanx - 4sinx = 1 i tried it but got a quartic formula :S 16sin^4x + 8sin^3x + 37sin^2x - 36 = 0
Friday, May 2, 2008 at 12:10am

trig
Solve the given triginometric equation analytically 7 sinx - 2 = 3(2 - sin x) If your are online, thank you my dear Reiny:) Priya
Thursday, May 1, 2008 at 7:38pm

trig
I am almost finished iwth my questionings:) Solve the given triginometric equation analytically sin4x - cos2x = 0 Priya
Thursday, May 1, 2008 at 6:56pm

trig
Solve the given triginometric equation analytically 2 sinx = tanx
Thursday, May 1, 2008 at 6:38pm

trig
If sin alpha = -3/5, sin beta = -5/13, P(alpha) is in the third quadrant, and P(beta) is in the fourth quadrant, find the following: a) sin (alpha - beta)
Thursday, May 1, 2008 at 6:22pm

trig
Please find sin (alpha/2) and cos (alpha/2) sec alpha = 3, -pi/2 < alpha < 0
Thursday, May 1, 2008 at 5:55pm

trig
Thursday, May 1, 2008 at 5:35pm

trig
Prove that, in general, sin(alpha + beta) does not equal sin alpha + sin beta
Thursday, May 1, 2008 at 5:33pm

trig
Solve without using a calculator or tables cos(5pi/6 + pi/4) Thank you Reiny!:)
Thursday, May 1, 2008 at 5:25pm

trig
If sin theta = x and -pi/2 is less than or equal to theta less than or equal to pi/2, find sin 2theta and cos 2theta in terms of x. Is it alright if I recommend you to my classmates tommorow? YOu seem to know more than my professor!
Thursday, May 1, 2008 at 5:09pm

trig
Solve the given triginometric equation analytically. Use values of of x for 0 less than or equal to x less than 2pi sin^2x - 2sinx = 1 How do I get towards the answer of 3.569, 5.856 Thank you again
Thursday, May 1, 2008 at 4:55pm

trig
e.g. tan 315 = -1, does that work in our equation ?? Yes, thank you again Reiny! My next question is to find sin theta and cos theta. cos 2theta = 1/3 and pi less than or equal to 2theta less than or equal to 2pi I hope Im not overburdening you with question:/
Thursday, May 1, 2008 at 4:46pm

trig
Solve the triginometric equation analytically. Use values of x for 0 less then or equal to x less then 2pi The equation for this question is sin2x + cos2x = 0
Thursday, May 1, 2008 at 4:40pm

trig
Solve the given triginometric equation analytically. Use values of x for 0 less than or equal to x less than 2pi P.S Thanks Reiny for your last post, if you are still online.
Thursday, May 1, 2008 at 4:31pm

trig
Evaluate without using a calculator or tables sin(pi/3 - 3pi/4) The answer is - 1+ square root of 3 / 2 square root of 2 How do I get this answer?
Thursday, May 1, 2008 at 4:26pm

trig
If 0 is less than or equal to 2theta less than or equal to pi and P(2theta)= (-7/25, 24/25), find P(theta)
Thursday, May 1, 2008 at 4:21pm

trig
Use the half angle formula to find cos(pi/12)
Thursday, May 1, 2008 at 4:18pm

trig
Find sin (alpha/2) and cos (alpha/2) sin alpha = 3, -pi/2 < alpha <less then or equal to 0 How to get the answer of sin (alpha/2) = -1/square root 3, cos(alpha/2) = square root 6/3?
Thursday, May 1, 2008 at 2:11pm

trig
If sinx = -3/5, tan x > 0, sec y = -13/5 and cot y < 0, find the following: a. csc(x + y) b. sec (x - y) How do I get the answers of a. -65/33 b. -65/16 Thank you
Thursday, May 1, 2008 at 2:08pm

trig
cotx = -2 and 0 less than or equal to x less than or equal to pi Find sin2x and cos2x How to get the answers of sin2x = -4/5, cos2x = 3/5?
Thursday, May 1, 2008 at 12:16am

trig
sinx = 4/5 and x terminates in Quadrant II Find sin2x and cos2x How to get the answers, which are sin2x = -24/25, cos2x = -7/25?
Thursday, May 1, 2008 at 12:14am

trig
tanx = 5/12 and sinx<0 Find sin2x and cos2x How to get the answers of sin2x = 120/169 and cos 2x = 119/169?
Thursday, May 1, 2008 at 12:12am

Math - Trig
Hi I have a Trig question that i dont understand, can someone please explain how to solve for it using cosine law?? A Clock with a radius of 15 cm has an 11 cm minute hand and a 7 cm hour hand. How far apart, to the nearest centimetre, are the tips of the hands at each time? a...
Wednesday, April 30, 2008 at 10:39am

trig
Find a polar equation of this conic with focus at the pole and the given eccentricity and directrix. e=2, r cos X =-1
Tuesday, April 29, 2008 at 3:44am

trig
what is the rectangular equation for r=12/(3-6cosX).
Tuesday, April 29, 2008 at 3:44am

trig
Find two standard position primary angles in radians by solving for the unknown. "Primary angles" are those angles which exist between 0 and 2pi. As usual, use exact values in your calculations. cosx - 2cos^2x = 0
Monday, April 28, 2008 at 6:00pm

trig
Find two standard position primary angles in radians by solving for the unknown. "Primary angles" are those angles which exist between 0 and 2pi. As usual, use exact values in your calculations. cotx + 1 = 0
Monday, April 28, 2008 at 5:59pm

trig
Sketch the graph of one cycle of tan(x)(pi/2=1.5708) and give the requested information Domain: Range: Period(wavelength): Asymptotes:
Monday, April 28, 2008 at 5:57pm

trig
What kind of reflection does the trig function y = cos(4x/3 minus 1) have?
Tuesday, April 22, 2008 at 12:03am

trig
What is the amplitude of y = (3sinx/2) + 4? Any link of proof would be appreciated if you have one Thank you
Monday, April 21, 2008 at 8:54pm

trig
What kind of reflection does the trig function y = cos(4x/3 minus 1) have?
Monday, April 21, 2008 at 8:53pm

trig
What is the shift along y of the trig function y = cos(4x/3 minus 1)? Any link of proof would be appreciated if you have one Thank you
Monday, April 21, 2008 at 8:52pm

trig
What is the shift along x of the trig function y = cos(4x/3 minus 1)? Any link of proof would be appreciated if you have one Thank you
Monday, April 21, 2008 at 8:51pm

Trig (inverse functions)
Problem: tan[arccsc(-5/3) + arctan(1/4)] My work: let arccsc(-5/3)=X and let arctan(1/4)=Y where -pi/2<=X<=pi/2, X cannot be 0 and where -pi/2<Y<pi/2 so that cscX=-5/3 and tanY=1/4 The problem can now be written as tan(X+Y) =tanX + tanY/1-tanXtanY which could also ...
Monday, April 21, 2008 at 3:16pm

trig
What is the range of the trig function sin(-3x+3)?
Monday, April 21, 2008 at 12:35am

trig
What is the shift along x of the following trig functions? y = (3sinx/2) + 4 y = -2sin(x)-4 y = sin(-3x + 3)
Monday, April 21, 2008 at 12:34am

trig
What kind of reflections are the following trig functions? y = 3cos(x-1) y = sin(-3x+3) y = -2sin(x)-4
Monday, April 21, 2008 at 12:33am

trig
y = 3cos(x-1) Shift along x: Shift along y: Kind of reflection:
Sunday, April 20, 2008 at 10:27pm

trig
I am doing a similar assignment as Anaa please help! y = 3cos(x-1) Amplitude: Period: Two x - intercepts: y-intercept: Domain: Range: Shift along x: Shift along y: Kind of reflection Thank you so much!
Saturday, April 19, 2008 at 10:45pm

trig
y = cos(4x/3 minus 1) amplitude? Period? Two x - intercepts? y-intercept? Domain? Range? Shift along x? Shift along y? Kind of reflection?
Saturday, April 19, 2008 at 6:59pm

trig
y = sin(-3x + 3) Amplitude = Period = Two x- intercepts = y - intercept = Domain = Range = Shift along x = Shift along y = Kind of reflection =
Saturday, April 19, 2008 at 5:58pm

trig
y = -2sin(x) - 4 Amplitude =_________ Period = __________ Two x- intercepts = __________ y - intercept = _____________ Domain = ___________ Range = ____________ Shift along x = ____________ Shift along y = _____________ Kind of reflection = ______________
Friday, April 18, 2008 at 10:19pm

trig
Describe the changes in the graph of the following funciton t(h) = -2/3sin(h) + 1
Thursday, April 17, 2008 at 9:09pm

trig
Describe the changes in the graph of the following funciton h(t) = sin(4/3 - 2t)
Thursday, April 17, 2008 at 9:09pm

trig
Give the phase shift in radians (along x) of f (x) = sin(x plus 4t+3/7)
Thursday, April 17, 2008 at 8:59pm

trig
Give the phase shift in radians (along x) of f (x) = sin (x - 3pi/5
Thursday, April 17, 2008 at 8:58pm

trig
What seven points of x can I put on the x axis over the interval -2pi less than or equal to x less than or equal to 2pi
Thursday, April 17, 2008 at 6:42pm

trig
Give an equation of a cosine function of x which has a phase shift along x of -1 unit and a wavelength of pi/3
Thursday, April 17, 2008 at 5:56pm

trig
Give an equation of a sine function of x which has a phase shift along y of -2 units and a wavelength of 3pi
Thursday, April 17, 2008 at 5:53pm

trig
Give an equation of a cosine function of x which has a phase shift along x of 5 units and an amplitude of 4
Thursday, April 17, 2008 at 5:51pm

trig
Suggest a cosine function that will "imitate" the sine function by manipulating ONE of a,b,c or d. Thank you
Thursday, April 17, 2008 at 5:50pm

trig
Suggest a sine function that will "imitate" the cosine function by manipulating ONE of a,b,c or d. Thank you
Thursday, April 17, 2008 at 5:50pm

trig
Please answer b)only a) If a triangle has angles of 35 and 65 degrees, what is the measurment of the third angle? Is it a right triangle? b)Find all angles of a right triangle triangle RST given that r = 18 cm and s = 20 cm
Wednesday, April 16, 2008 at 11:09pm

trig
A geologist stands on the shore of a lake in Ontario with a theodolite and finds that the angle of inclination to the top of a distant rock pillar is 28.5 degrees. He then walks 10 m along the shore at a 90 degree angle to his measurment, and finds that the angle to the same ...
Wednesday, April 16, 2008 at 10:56pm

trig
Find all angles of a right triangle triangle RST given that r = 18 cm and s = 20 cm
Wednesday, April 16, 2008 at 10:54pm

trig
Work out the following identities a) sin theta/cos theta b) tan theta cos theta
Wednesday, April 16, 2008 at 10:52pm

trig
If an angle is pie radians, what is the arc length in radians?
Wednesday, April 16, 2008 at 10:50pm

trig
If an angle is 1 radian, what is the arc length in radians?
Wednesday, April 16, 2008 at 10:50pm

Trig
Simplify: csc A - sin A - Cot A Cot A Csc A 1/sin - sin A - 1/tan 1/tan 1/sin -sinA?
Wednesday, April 16, 2008 at 9:58pm

trig
Sec(2a0)=Sec^a/2-sec^2a
Wednesday, April 16, 2008 at 10:48am

math
solve the following trig equation : 7 = 8sin(1/2)x. I can solve this using the half-angle indentity. But i need to solve this using period and phase change equation. how do i do this?
Wednesday, April 16, 2008 at 12:01am

trig
3x - y = -4
Monday, April 14, 2008 at 8:21pm

trig
1-tan^2x/ 1-cot^2x = 1-sec^2 x
Monday, April 14, 2008 at 7:00pm

trig help
verify that cos(A-B)/cosAsinB=tanA+cotB is an identity
Monday, April 14, 2008 at 12:03pm

trig
write the expression sin4xsin5x as a sum or difference of trigonometric functions
Monday, April 14, 2008 at 11:58am

trig
give the exact real number value without using a calculator sin[(cos^-1)(1/4)] sin[(tan^-1)(3/4)+(tan^-1)(12/5)]
Monday, April 14, 2008 at 11:37am

Math (Trig) a.s.a.p, thanks!
verify the identities: 1.) 2tanx-(1+tanx)^2 = -secx 2.) cos(x-330degrees)=1/2(ã3cos​x-sinx) *the ãis only over the 3* 3.) 1+cos2x/sinx=cotx any help is greatly appreciated!!
Thursday, April 10, 2008 at 8:43am

trig
What is the amplitude,phase shift and period of y=sin 2x? What is the amplitude, phase shift and period of y= sin2(x + 3.14/4)
Wednesday, April 9, 2008 at 7:12pm

Math (Trig)
sorry, another I can't figure out Show that (1-cot^2x)/(tan^2x-1)=cot^2x I started by factoring both as difference of squares. Would I be better served by writing in terms of sine and cosine? Such as: [1-(cos^2x/sin^2x)]/[(sin^2x/cos^2x)-1]=​(cos^2x/sin^2x)
Wednesday, April 9, 2008 at 2:06pm

Trig
Solve in terms of sine and cosine: sec(x) csc(x)- sec(x) sin(x) so far I have: 1/cos(x) 1/sin(x) - 1/cos(x) sin(x) I am not sure where to go to from there. The book says the answer is cot(x) or cos(x)/sin(x) Thank you in advance.
Wednesday, April 9, 2008 at 10:36am

trig
Tuesday, April 8, 2008 at 10:08pm

trig
A geologist stands on the shore of a lake in Ontario with a theodolite and finds that the angle of inclination to the top of a distant rock pillar is 28.5 degrees. He then walks 10 m along the shore at a 90 degree angle to his measurment, and finds that the angle to the same ...
Tuesday, April 8, 2008 at 10:05pm

trig
Find all angles of a right triangle RST given that r = 18cm and s=20 cm
Tuesday, April 8, 2008 at 10:02pm

trig
If a triangle has angles 35 and 65 degrees, what is the measurment of the third angle? Is it a right triangle?
Tuesday, April 8, 2008 at 10:01pm

trig
Work out the following identities a)sin pheta / cos pheta b)tan pheta cos pheta
Tuesday, April 8, 2008 at 10:00pm

trig
If a = 5 cm and b = 3cm, use the Pythagorean Theorem to find c
Tuesday, April 8, 2008 at 9:59pm

trig
I have heard that trig CAN be super easy, that there are just, like, 10 rules you need to memorize then all the problems are easy. ... Does anyone know what these are? Thanks!
Monday, April 7, 2008 at 12:20am

math [basic trig]
Sam and Markus are standing on level ground 100m apart. A large tree is due North of Markus and on a bearing of 065degrees from Sam. The top of the tree appears at an angle of elevation of 25 degrees to Sam and 15 degrees to Markus. Find the height of the tree.
Tuesday, March 25, 2008 at 8:34pm

trig
Am I right on this? 2sec^2(2x)-8=0 2sec^2(2x)=8 divide by 2 sec^2(2x)=4 find square root sec(2x)=2 Now, would this simply be asking me to find where secant is equal to one? Or is there no solution because secan't (pun intended) be equal to anything above 1?
Sunday, March 23, 2008 at 6:34pm

trig
2sin(x)cos(x)+cos(x)=0 I'm looking for exact value solutions in [0, 3π] So I need to find general solutions to solve the equation. But do I eliminate cos(x), like this... 2sin(x)cos(x)+cos(x)=0 2sin(x)cos(x)= -cos(x) 2sin(x) = -1 sin(x) = -1/2 at 4pi/3 and 5pi/3 and ...
Sunday, March 23, 2008 at 4:52pm

trig
I am having trouble figuring these two out The directions say find all solutions to the triangles described below. Round each angle to the nearest degree and the length of the missing side to the nearest tenth at the end of the computations C= 27 degrees 50 minutes, c= 349 m, ...
Wednesday, March 19, 2008 at 4:42pm

trig
eliminate the parameter t from the following x = 4 sin t y= 7 cos t sketch the graph
Friday, March 14, 2008 at 1:27pm

trig
eliminate the parameter t from the following x = 9sin t y = 9cos t
Friday, March 14, 2008 at 1:26pm

trig
Write an expression that gives all solutions to the equation sin x + cos x = - radical 2
Friday, March 14, 2008 at 10:29am

Trig
Solev the equation for t if 0 is less than or eual to t which is less than 2 pi 7sin + radical3 = 5 sin t
Thursday, March 13, 2008 at 10:50am

Trig
Find the exact value of: cos315. I have to use the sum angle formula cos(270+45) cos270 cos45 - sin270 sin45 thats all I have. Is the answer at least sqrt 2/2?
Friday, March 7, 2008 at 10:00pm

Trig
Simplify: (1/secx+sin^2x/cosx)cosx. Explain alittle bit, not just do the steps please.
Friday, March 7, 2008 at 9:45pm

Trig
Find secx if sinx = -4/5 and 270 < x < 360. tan^2x+1=sec^2x (-4/5)^2+1=sec^2x 16/25+1=sec^2x 17/25=sec^2x sqrt 17/5 I don't know if it should be positive or negative.
Friday, March 7, 2008 at 9:42pm

Trig
State the vertical shift and the equation of the midline for y=4cosx-1. k = -1 y = -1 vertical shift = -1 midline equation is y=-1
Friday, March 7, 2008 at 9:27pm

Trig
Find the amplitude, if it exists, and the period of: y=tan1/4x. no amplitude I got confused, is the period 4pi? And is that the same as saying 360 degrees?
Friday, March 7, 2008 at 9:22pm

Trig(Last 6 questions to check. Thanks to EVERYONE
Find the amplitude, if it exists, and the period of: y=cos3x. |a|=|1| amplitude = 1 period = 360/b period = 360/3 period = 120 degrees
Friday, March 7, 2008 at 9:19pm

Trig
Verify that (secx/sinx)*(cotx/cscx)=cscx is an identity. (x=theta BTW)
Friday, March 7, 2008 at 1:51pm

Trig
Solve: x=Arctan(-sqrt3).
Friday, March 7, 2008 at 1:44pm

Trig
P(-15/17,-8/17) is found on the unit circle. Find sin theta and cos theta. P(-15/17,-8/17)= P(cos theta,sin theta) sin=-8/17 cos=-15/17
Friday, March 7, 2008 at 1:42pm

Trig
Should the triangle be solved beginning with Law of Sines of Law of Cosines. Then solve the triangle. Round to the nearest tenth. A=56 degrees, B=38 degrees, a=13. Sines. I get confused on the formula. I know C=86 degrees
Friday, March 7, 2008 at 1:38pm

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