Thursday
March 13, 2014

# Homework Help: Math: Trigonometry

Math, Trig
Thanks so much!
Monday, October 1, 2012 at 9:07pm

Math, Trig
Draw a "side view" Draw 3 points on the river, B , C, and D , B to the left of the points draw a point A above B so that angle B is 90° Join AC and AC , so that CD = 20 Mark angle ADC = 62.6° and angle ACB = 72.8° label AB =h (h is the height) , BC = x in...
Monday, October 1, 2012 at 8:46pm

trig
a plane flying 33,000 ft is 130 miles from the airport when it begins to descend if the angle of descent is constant find this angle
Monday, October 1, 2012 at 8:31pm

Math, Trig
The high level bridge, a railway bridge that crosses the Oldman River is over 1km long. From one point on the river, the angle of elevation of the top of the bridge is 62.6 degrees. From a point 20m closer to the bridge, the angle of elevation of the top of the bridge is 72.8 ...
Monday, October 1, 2012 at 8:00pm

trig
what's the trouble? Just trace the circle twice. If you have to label some points along the way, just label each marked point with two values: pi/2,5pi/2 and so on
Friday, September 28, 2012 at 11:24am

trig
i have to draw a flat unit circle all the way to 4 pi in radians. i can get to 2 pi but i have trouble finding the radians if i went one more time around the unit circle.
Friday, September 28, 2012 at 1:04am

Math/Trig
I am assuming that 0° is east. If you are using 0° = north, then things have to be changed a bit.
Thursday, September 27, 2012 at 11:36am

Math/Trig
150 at 180° = (-150,0) 170 at 210°50' = (-146,-87) total: (-296,-87) distance = √(296^2 + 87^2) = 309 mi
Thursday, September 27, 2012 at 11:35am

Math/Trig
An airplane leaves an airport and flies due west 150 miles and then 170 miles in the direction 210°50'. Assuming the Earth is flat, how far is the plane from the airport at this time (to the nearest mile)
Thursday, September 27, 2012 at 10:15am

Precalc/Trig
wave is modeled by the function ... h(t) = 3cos(p/10)*t What is the period of the wave (T) *frequency (F) is defined as the number of cycles of the motion per second. What is the relationship between F and T? Find the wave height (H) which is the vertical distance between the ...
Wednesday, September 26, 2012 at 9:17am

trig
X = -23 Mi. Y = 14 Mi. tanA = Y/X = 14/-23 = -0.60870 A = -31.33o,CW = 148.7o,CCW. D = X/cosA = -23/cos148.7 = 26.9 Mi Bearing = 148.7 - 90 = 58.7o.
Tuesday, September 25, 2012 at 7:24pm

Trig
if the ladder has length x, 4/x = cos 40° x = 5.22 ft
Tuesday, September 25, 2012 at 2:54pm

Trig
A ladder is resting against a wall. The ladder and the ground and angle of 40 degrees and the ladder is 4 ft. from the wall. How long is the ladder?
Tuesday, September 25, 2012 at 1:53pm

science
Use kinematics to calculate the height for the firstball, which is Vf=0 a=9.8 t=1.5 because you take the total time it take to go up and come back down and divide it by 2. 3/2 = 1.5 getting an initial velocity of Voy= 14.7m/s V = t(9.8) = 1.5(9.8) = 14.7 This must have the ...
Tuesday, September 25, 2012 at 12:01am

Trig
A sprinkler on a golf green is set to spray water over a distance of 20 meters and to rotate through an angle of 160°. Find the area of the region that can be irrigated with the sprinkler. (Round your answer to two decimal places.) I really have no idea how to go about ...
Monday, September 24, 2012 at 8:23pm

Trig
Two ships leave the same port at 7.am. The first ship sails towards europe on a 54 degree course at a constant rate of 36 mi/h. The second ship,neither a tropical destination, sails on a 144 degree course at a constant speed of 42 mi/h. Find the distance between the ships at ...
Monday, September 24, 2012 at 7:01pm

trig
A boat is 23 mi due west of lighthouse A. Lighthouse B is 14 mi due north of lighthousenA. Find the bearing of lighthouse B from the boat and the distance from lighthousenB tho the boat.
Monday, September 24, 2012 at 6:40pm

trig
A boat is 23 mi due west of lighthouse A. Lighthouse B is 14 mi due north of lighthousenA. Find the bearing of lighthouse B from the boat and the distance from lighthousenB tho the boat.
Monday, September 24, 2012 at 6:32pm

small typo -Trig
near the 2/3 mark of solution should say so P is (10.8 , 9.6) typo had no effect on rest of solution
Sunday, September 23, 2012 at 9:36pm

Trig
Put the diagram on the x-y grid so the centre of the circle for the cylinder is C(6,6) Let P(x,y) be the point of contact of the ladder with the cylinder. Slope of ladder touching at P is -3/4 So the slope of PC = 4/3 (y-6)/(x-6) = 4/3 4(y-6) = 3(x-6) y-6 = (3/4)(x-6) #1 ...
Sunday, September 23, 2012 at 9:34pm

Trig
Draw a picture of a right triangle. The hypotenuse (the longest side opposite of the ninety degree angle) would be 16. The opposite of the desired angle is 12. The sine of what angle equals 12/16 (6/8 3/4)?
Sunday, September 23, 2012 at 9:09pm

Trig
use the equation y=mx+b
Sunday, September 23, 2012 at 8:54pm

Trig
A cylindrical tank, 6 foot in radius, lies on it's side parallel and against the side of a warehouse. A ladder leans against the building, passes over and just touches the tank, and has a slope of -3/4. Find the equation of the ladder and the length of the ladder
Sunday, September 23, 2012 at 8:47pm

trig
A woman that is 5'4" stands 15 ft from a streetlight and casts a four-foot long shadow. Determine the height of the streetlight and the degree measure of the angle of elevation form the tip of her shadow to the top of the streetlight, both accurate to two decimal places.
Sunday, September 23, 2012 at 5:59pm

Trig
A 16 - foot ladder leaning against the side of a house reaches 12 feet up the side of the house. What angle does the ladder make with the ground
Sunday, September 23, 2012 at 5:02pm

TRIG
a) one rotation = 2π radians so 4400 rpm = 2π(4400) radians/min = 8800π rad/min = appr 27646 rad/min b) one rotation = 2π(8.5) inches = 17π inches so 4400 rotations would be 17π(4400) inches = 74800π so the linear speed of a tooth = 74800&#...
Sunday, September 23, 2012 at 2:41pm

TRIG
A circular power saw has an 8-1/2 inch diameter blade that rotates at 4400 revolutions per minute. a)Find the angular speed of the saw blade in radians per minute. b)Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut. I&#...
Sunday, September 23, 2012 at 12:26pm

trig
Write 8y = 300 in its equivalent logarithmic form
Friday, September 21, 2012 at 3:52pm

math/trig
if the flagpole has height h, h/44 = tan 60.5° h = 77.77 now you want the angle x where 77.77/88 = tan x x = 41.5°
Tuesday, September 18, 2012 at 10:59am

math/trig
What does the ladder have to do with the flagpole?
Monday, September 17, 2012 at 11:35pm

math/trig
A flagpole casts a shadow 44 ft with the sun angle of elevation is 60.5 degrees. Find the height of the flagpole and at what angle is the shadow twice as long?
Monday, September 17, 2012 at 11:18pm

math/trig
A 16 ft ladder casts a shadow 44 ft with the sun angle of elevation is 60.5 degrees. Find the height of the flagpole and at what angle is the shadow twice as long?
Monday, September 17, 2012 at 11:16pm

trig
I think you mean find all angles theta between 0 and 2pi.
Sunday, September 16, 2012 at 12:26pm

Definite Integral
The way to get their answer is to complete the square and then use trig substitution. If you go to wolframalpha.com and type in ∫ (5x + 3) / (x^2 + 4x + 7) dx then click the "Show Steps" button you can see how they did it. If you want the final numeric answer, ...
Saturday, September 15, 2012 at 11:18pm

trig
construct your right-angled triangle by drawing a perpendicular to the x-axis from (1,-4) then r^2 = x^2 + y^2 = 1 + 16 r = √17 b) sinA = -4/√17 cscA = -√17/4 cosA = 1/√17 secA = √17 tanA = -4/1 = -4 cotA = -1/4
Saturday, September 15, 2012 at 7:49pm

trig
-20000/360 = -55.555555.. = -55 - 200/360 so we have 55 clockwise rotations and then another clockwise rotation of 160° OR 360-200 = 160° in the counterclockwise of positive rotation direction 160° is in the second quadrant, where the sine is positve and we are 20&...
Saturday, September 15, 2012 at 7:43pm

trig
(a) sketch an angle A in standard position whose terminal ray passses through the point (1,-4) (b) Find the exact value of the six trigonometric functions of A, (c) Let B be the reference angle of A. Find a point on the terminal rsy of B in standard position and add B to your ...
Saturday, September 15, 2012 at 4:47pm

trig
find the reference angle of -20000 and express the six trigonometric functions of -20000 in terms of the six trigonometric functions of its reference angle.
Saturday, September 15, 2012 at 4:40pm

trig
my question is find all angles of theta and 2pi whose reference angle is alpha = pi/12. Give exact answers. i cannot for the live of me find this
Saturday, September 15, 2012 at 4:30pm

math
first of all, to make things easier to type, let's say h = delta x so your question becomes lim [ sin(π/6 + h) - sin π/6 ]/h , as h ---> 0 This looks like you want the derivative of sin x, when x = π/6 if f(x) = sinx f'(x) = cosx f'(π/6) = ...
Thursday, September 13, 2012 at 10:12am

Calculus
One of the fundamental limits with trig expressions is Lim tanx/x = 1 , as x---> 0 so notice that you have exactly that pattern, so lim tan(4Ø)/(4Ø) =1 , assuming 4Ø ---> 0
Wednesday, September 12, 2012 at 2:42pm

Math
Actually it probably has something to do with trig identities...
Tuesday, September 11, 2012 at 11:09pm

Algebra 2/Trig
A 5'6" person is standing near a light post that is 18' above the ground. How long is the man's shadow when he is 5' from the base of the light post?
Tuesday, September 11, 2012 at 8:47pm

trig
53. the longest side is 55 cm. find the length of the shortest side
Tuesday, September 11, 2012 at 7:59pm

Physics
Picture a right angled triangle with one side AB being 25 x 125 metres long to the west; the other side BC being 19 x 66 metres long to the south. The displacement is the length of the hypotenuse AC; the direction being between 180 degrees and west. Sketch it out, then do the ...
Tuesday, September 11, 2012 at 8:39am

Math - Trig
find in degrees and radians the angle between the hour hand and the minute hand of a clock at half past three
Sunday, September 9, 2012 at 8:44am

Calculus
You're ok to this point: 10 sin^-1 (5x)(x) + 2√(1-25x^2) + C |1/5, 1/10 By this time you should realize that radians are the measure of choice for trig stuff. sin^-1(1/2) = pi/6 sin^-1(1) = pi/2 so you end up with [10(1/5 * pi/2) + 2√(1-1)] - [10(1/10 * pi/6...
Friday, September 7, 2012 at 10:07am

Calculus
think back, back, back to your days in trig. d^2 = 350^2 + 400^2 - 2*350*400*cos 50 d = 320.19
Monday, September 3, 2012 at 12:42pm

calculus
think back, back, back to your days in trig. If the tower has height h, tan 67 = h/50 h = 117.8 m
Monday, September 3, 2012 at 12:36pm

math trig
unless you can measure the angle, you have to use similar triangles. If you can measure the angle sighting from the tip of the stick's shadow to the top of the stick, then tanθ = opposite/adjacent The same angle is made from the pole's shadow to the top of the ...
Friday, August 31, 2012 at 6:08pm

math trig
I think i have to use soh cah toa instead of similar triangles
Friday, August 31, 2012 at 4:46pm

math trig
stick a stick vertically in the ground. measure the height and shadow of the stick. measure the shadow of the tree, and use the same ratio to calculate its height. extra credit: why does this work?
Friday, August 31, 2012 at 4:17pm

math trig
lets say you have a tree or a flagpole. Describe how you would measure this object using right angled triganometry
Friday, August 31, 2012 at 11:35am

trig
My calculator says sin(70°)=0.93969262
Friday, August 31, 2012 at 8:06am

trig
what is the value of sin 70
Friday, August 31, 2012 at 1:51am

trig
Sin (180 - A) = sin A. (angle in degrees) sin 120 = sin (180 - 60) = sin 60 Cos (180 - A) = - cos A cos 150 = cos (180 - 30) = - cos 30 tan (360 - A) = - tan A, tan 280 = tan (360 - 80) = - tan 80
Friday, August 31, 2012 at 12:20am

trig
how to prove ; tan 10 degrees + tan 70 degrees - tan 50 degrees = sqrt 3
Friday, August 31, 2012 at 12:08am

Math
velocity is v = dh/dt = -sin(2t) average v over an interval is ∫[1,3] dv/dt / (3-1) = 1/2 ∫[1,3] -sin(2t) dt = 1/2 (1/2 cos 2t) [1,3] = 1/4 (cos6-cos1) = 1/4 (.4198) = 0.105 Note that this is just the total displacement / total time h(pi)-h(0) = .5(1) - .5(1) = 0 ...
Wednesday, August 29, 2012 at 2:19pm

trig
pick any real number x > 0. x/2 < x so there is always a smaller positive real same for rational numbers pick any y such that x < y The difference is (y-x) x < x + (y-x)/2 < y
Tuesday, August 28, 2012 at 3:09pm

trig
prove that there exists no smallest possitive real number dose there exist a smallest positive rational number given a real number x, does there exist a smallest real y>x?
Tuesday, August 28, 2012 at 2:40pm

Now Sabrina, We did the previous problem for you. It is very similar to this problem. Please try it. It is really just trig.
Monday, August 27, 2012 at 8:11am

Math (Trig/pre-calculus)
nevermind, I figured it out, it is approximately 4.1 x10^13 km from the star
Thursday, August 23, 2012 at 10:29pm

Math (Trig/pre-calculus)
some stars are so far away that their position appear fixed as earth orbits the sun. other stars, however, appear over time to shift their positions relative to the background of "fixed" stars. suppose that the star shown below appears to shift through an arc of ...
Thursday, August 23, 2012 at 9:52pm

Trig
-17 pi/6
Monday, August 20, 2012 at 11:37am

trig
The Tangent Function: tanA = Y/X = 8/6.
Wednesday, August 15, 2012 at 7:05pm

trig
Imagine that you are sitting 6 feet away from a television that is hung on a wall. The top of the TV is 8 feet off the ground. Which function correctly represents the angle that you make with the top of your television?
Wednesday, August 15, 2012 at 2:34pm

math
how would I measure a distance or object using right angled trig?
Tuesday, August 14, 2012 at 10:43pm

trig
If Ø is your angle, and since r=√(a^2 + b^2) sinØ = b/r cscØ = r/b cosØ = a/r secØ = r/a tanØ = b/a cotØ = a/b These definitions should be in your textbook and are probably defined in terms of x, y and r. You should ...
Monday, August 13, 2012 at 9:02pm

trig
Let  be an angle in standard position and the point (a, b) be the point of intersection of the terminal side of  with the unit circle. State the unit circle definitions of the six trigonometric functions. cos = sec = sin = csc = tan = cot =
Monday, August 13, 2012 at 8:53pm

trig
sin -1 as principal values in [-π/2,π/2] sin -1-.5 = -π/6
Monday, August 13, 2012 at 5:24pm

trig
find the exact value of the expression , sin-1(-0.5)
Monday, August 13, 2012 at 3:58pm

trig
sin(x) has amplitude 1, period 2pi, no phase shift sin(x-pi/3) is shifted pi/3 to the right sin(2(x-pi/3)) has period pi, shifted right by pi/3 2sin(2(x-pi/3)) meets the requirements. Do the others in lime wise. Recall that tan(x) has period pi, not 2pi.
Monday, August 13, 2012 at 12:15am

trig
13
Sunday, August 12, 2012 at 8:46pm

trig
Construct the equations of the following trigonometric functions: A)A sine function with amplitude 2, period , phase shift /3 right B)A tangent function with a reflection in the y-axis, period ¾, translation up 5 units C)A cosine function with period 270°, ...
Sunday, August 12, 2012 at 7:07pm

trig
you know that sin(x) has maximum value at x = pi/2. So, x - pi/3 = pi/2, or x = 5pi/6. However, that is not in the interval [0,2]. So, try x - pi/3 = -3pi/2. x = -7pi/6. So, y does not achieve its maximum possible value over x in [0,2]. So, the max achieved in [0,2] occurs ...
Sunday, August 12, 2012 at 1:58pm

trig
For the function -2sin(x-(pi/3)) between x = 0 and x = 2 : (6 marks) For what value(s) of x does y have its maximum value? For what value(s) of x does y have its minimum value? For what value(s) of x does y=1?
Sunday, August 12, 2012 at 1:44pm

trig
Determine the period, amplitude and phase shift for each given function: A)y = -4 cos 3x + 5 B)y = 2/3 sin (30x-90degrees)-10 c)y = -0.38 tan (x/3+pi/3) d)y = pi cos(2x)+ pi
Sunday, August 12, 2012 at 1:33pm

trig
start-> programs-> Accessories-> Calculator-> View-> Scintific 17 sin
Thursday, August 9, 2012 at 11:40pm

trig
Thursday, August 9, 2012 at 10:33pm

trig
One of the first things I usually do is test if the identity is true by picking any value of x. Since it is an identity it should work for all value of x let x=10 LS = (1/cos80 -1)/(1/cos40-1) = appr 15.58 RS = tan80/tan40 = appr 6.758 so , not true, no point trying to prove it.
Thursday, August 9, 2012 at 12:39pm

trig
(sec 8 x - 1)/(sec 4x -1) = tan 8x/tan 4x Prove it!
Thursday, August 9, 2012 at 11:57am

algebra/trig
1. Which numbers are NOT perfect squares? 2. √48-5√27+2√75 = √16√3 - 5√9√3 + 2√25√3 = 4√3 - 15√3 + 10√3 = -√3 3. I will assume you meant √(x+2) - 3 = 0 then √(x+2) = 3 square both sides x...
Tuesday, August 7, 2012 at 10:46am

algebra/trig
1. let y = x^3 + 5 inverse is x = y^3 + 5 y^3 = x-5 y = (x-5)^(1/3) yes , it is a function 2. (f∙ g)(2) = f(g(2)) = f(3) = 10 3. Come on, you can do this!
Tuesday, August 7, 2012 at 10:39am

algebra/trig
1. which number below is irrational? a)√4/9 b) √20 c)√121 Why is the number you chose irrational? 2. express in simplest form: √48-5√27+2√75 3. solve for x: (√x+2)-3=0
Tuesday, August 7, 2012 at 9:59am

algebra/trig
1. f(x)=x^3+5 does f(x) have an inverse? if so, find the inverse and decide if it is a function. 2. if f(x)= 3x+1 and g(x)= x^2-1, find (f∙ g)(2) 3. if f(x)= (2x)^2, find f(-4) thank you :)
Tuesday, August 7, 2012 at 9:51am

mathematics
Given y = 3cos2x you know it has amplitude of 3, so its minimum value is y = -3, since there is no y-translation. Unless you are specifically doing calculus, I'd surely use my knowledge of trig to answer this one. Good analysis, though, Bosnian!
Saturday, August 4, 2012 at 12:11pm

Calculus 1 Integration Trig Inverse
Tuesday, July 31, 2012 at 11:03am

Caculus:Integration Inverse Trig
for integrating 1/√(x^2-1) use x = secθ Then x√(x^2-1) = secθtanθ dx = secθtanθ dθ The integral of the first term then becomes ∫4 dθ = 4θ = 4 arcsec(x) for integrating 1/(1+x^2) use x = tanθ dx = sec^2θ dθ...
Tuesday, July 31, 2012 at 11:02am

Calculus 1 Integration Trig Inverse
integral of (4/(x times the square root of (x^2-1)) + (1+x+x^3)/(1+x^2)dx
Monday, July 30, 2012 at 10:42pm

Caculus:Integration Inverse Trig
integral of (4/(x times the square root of( x^2-1)) + (1+x+x^3)/(1+x^2)dx
Monday, July 30, 2012 at 10:40pm

physics
You can just use basic Trig a few times. First, find x1 and y1 (I’m defining these as the x and y components of the first triangle, the one where a is the hypotenuse. I drew them in green in the diagram above). x1 = 175*cos(30) y1 = 175*sin(30) You can do the same thing ...
Sunday, July 29, 2012 at 1:50am

Thank you! Next question. What if instead they gave me the hypotenuse? 2/(sqrt2? Still tan 30.
Friday, July 27, 2012 at 10:50am

trig
For the second, draw you triangle in quadrant II hypotenuse = 3 , opposite = 1 x^2 + 1 = 9 x = ±√8 or ±2√2 , but we are in II, so use x - -2√2 cosØ = -1/3 tanØ = - 1/2√2 ---> cotØ = -2√2 I don't know how ...
Friday, July 27, 2012 at 8:53am

trig
so cos would be root 15/ 4 and cot would be 1/ root 15? one more question, how do you know it is in the second quadrant?
Friday, July 27, 2012 at 12:43am

trig
given cosØ = 2/3 and cotØ > 0 so Ø must be in quadrant I make a sketch of a right -angled triangle with hypotenuse 3 and adjacent 2 then y^2 + 2^2 = 3^2 y = √5 and sin Ø - √5/3 tanØ = √5/2 do the second the same way (&...
Thursday, July 26, 2012 at 11:48pm

trig
find sin theta and tan theta if cos theta = 2/3 and cot theta is >0 and find cos theta and cot theta if sin theta = 1/3 and tan theta is <0 thanks! :)
Thursday, July 26, 2012 at 11:23pm

Trig Functions
cosine, sine, vary between 1, -1? So they cannot be in the correct answer.
Thursday, July 26, 2012 at 5:11pm

Trig Functions
Which of the following lists contains only functions with vertical asymptotes in their graphs? A. Cosine, sine, tangent, cotangent B. Tangent, secant, cosecant, cotangent C. Sine, tangent, secant, cosecant D. Cosine, sine, secant, cosecant
Thursday, July 26, 2012 at 4:23pm