# Homework Help: Math: Trigonometry

## Recent Homework Questions About Trigonometry

**trig**

The angle of depression as measured from the top of a 41 foot tower to a reference point on the ground is 65 degrees. How far away, to the nearest foot, is the reference point from the base of the tower?

*Wednesday, May 8, 2013 by Anonymous*

**Trig**

Use sum and difference identitites to find the exact value of co 15 degrees

*Wednesday, May 8, 2013 by Christy*

**trig identities**

Find the exact value of cos (2theta) given csc theta = 8/3 and 0 < theta < pi/2

*Wednesday, May 8, 2013 by Sean*

**trig**

find the minimum and maximum value of sin100 degree plus cos100 degree

*Tuesday, May 7, 2013 by ria*

**trig**

If a flywheel 8 ft. in diameter rotates at 80 rpm., what is the linear velocity of a point on the outside edge, in feet per minute in terms of pi?

*Tuesday, May 7, 2013 by Garrett*

**Trig**

cos[(tan^-1(3/4))+(cos^-1(9/41))]

*Monday, May 6, 2013 by Hannah*

**Trig**

csc thea= -2, quadrant 4. what are the six trig functions?

*Monday, May 6, 2013 by Shay*

**trig**

A slide is attached to the side of a tree house. The height of the tree house is 6 less than double the distance from the baswe of the tree to the base of the slide. The length of the slide is 3 more than the height of the tree house. Find the length of the slide.

*Sunday, May 5, 2013 by Kendra*

**Advanced Functions/Trig**

Prove the identity: cos^4 x + sin^4 x = 1 - (1/2)sin^2 (2x)

*Sunday, May 5, 2013 by Zack*

**Trig(I think)**

Suppose oil spills from a ruptured tanker and spreads in a circular pattern. If the radius of the oil spill increases at a constant rate of 1m/s, how fast is the area of the spill increasing when the radius is 30m?

*Monday, April 29, 2013 by Kelly*

**trig**

at one point in the day, a tower that is 150 feet high casts a shadow that is 210 feet long. Find, to the nearest tenth of a degree, the angle of elevation of the sun at that point

*Sunday, April 28, 2013 by ainy*

**trig**

cos(t)=3/5 determine the exact value of t to the nearest degree

*Saturday, April 27, 2013 by Anonymous*

**trig**

solve the point given below is on the terminal side of an angle0. find the exact value of the six trigonometric functions of 0. (10,-10)

*Saturday, April 27, 2013 by Anonymous*

**trig**

how many solutions (answers) does this equation has? sinx=sin1

*Saturday, April 27, 2013 by Eee*

**trig**

how to do this? how much does this equals? 2cos160*cos140*cos100

*Saturday, April 27, 2013 by Eee*

**trig**

Convert 11pi/5 radians into degrees.

*Wednesday, April 24, 2013 by danni*

**trig**

Convert 11pi/5 radians into degrees.

*Wednesday, April 24, 2013 by danni*

**Trig**

A parabola has its vertex on the graph of the line y=3x+1 and passes through (1,10). If it is the same size,? shape, and direction as the graph of y=3x^2, find the equation (s) of all possible parabolas Thanks!!!

*Wednesday, April 24, 2013 by Rebekah*

**Trig**

Convert 2xy = 1 to polar form.

*Monday, April 22, 2013 by Lost One*

**Trig**

Rewrite -2x^2 + sqrt(3)xy - y^2 +2 = 0 with the xy term eliminated. Round terms to nearest hundredth.

*Monday, April 22, 2013 by Lost One*

**trig**

A kite is in the shape of a quadrilateral with two pair of congruent adjacent sides. The lengths of two sides are 20.0 inches and the lengths of the other two sides are 35.0 inches. The two shorter sides meet at an angke of 115 degrees. A. Find the length of the diagonal ...

*Sunday, April 21, 2013 by Anonymous*

**trig**

Two tracking stations are on the equator 135 miles apart. A weather balloon is located on a bearing of N 37 degrees E from the weastern station and on a bearing of N 19 degrees E from the eastern station. How far is the balloon from the weastern station?

*Sunday, April 21, 2013 by Taylor*

**trig**

A pole is braced by two wires that extended from the top of the pole to the ground. The lengths of the wires are 16 feet and 18 feet and the measure of the angle between the wires is 110 degrees. Find, to the nearest foot, the distance between the points at which the wires are...

*Sunday, April 21, 2013 by Anonymous*

**Trig**

A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane? Round to one decimal place.

*Sunday, April 21, 2013 by Nancy*

**Advanced Functions/Trig**

Prove the following: sin(x+y)sin(x-y) = cos^2 (y) - cos^2 (x)

*Sunday, April 21, 2013 by Zack*

**Trig**

This has to do with vectors...I'm wondering if I set up the diagram correctly? A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane?

*Saturday, April 20, 2013 by Mary*

**Trig**

This has to do with dot products (I can't make the arrow above the u, i, or j). Given u = 4i - 6j and v = -3i + 5j, find 4u-(1/2)v Am I just supposed to plug in what u and v are equal to in 4u-(1/2)v? If so, is the answer (35/2i - 53/2j)

*Saturday, April 20, 2013 by Mary*

**trig**

Solve exactly over the indicated interval: 2sinx+cscx=3, 0<theta<360

*Thursday, April 18, 2013 by Anonymous*

**Trig**

A 12 foot ladder leans against a building. The top of the ladder leans against the wall 10.5 feet from the ground. What is the angle formed by the ground and the ladder? Assume its a right triangle.

*Wednesday, April 17, 2013 by Charlie*

**Trig**

solve over the indicated interval expressed in degrees to 2 decimal places. sec(theta/2)=1.4275, 0<theta<360degrees

*Wednesday, April 17, 2013 by Anonymous*

**trig**

solve exactly over the indicated interval: cot(theta)=0, all real numbers

*Wednesday, April 17, 2013 by Anonymous*

**trig**

Find minimum value of 2cos x + 2cos y

*Wednesday, April 17, 2013 by vikrant*

**trig**

Find minimum value of 2cos x + 2cos y

*Wednesday, April 17, 2013 by vikrant*

**trig**

Find minimum value of 2cos x + 2cos y

*Wednesday, April 17, 2013 by vikrant*

**Math-Trig**

Find all angles in degrees that satisfy each equation. tan(a)+rad3=0

*Tuesday, April 16, 2013 by Savana*

**Trig**

From a certain distance from the base of a Giant Sequoia tree a surveyor determines that the angle of elevation to the top of the tree is 47deg. The surveyor then walks 100 feet away from the tree and determines that the angle of elevation to the top of the tree is now 37deg. ...

*Tuesday, April 16, 2013 by Mary*

**Trig**

Rewrite 6x^2 - sqrt(3)xy + 5y^2 - 9 = 0 with the xy term eliminated.

*Tuesday, April 16, 2013 by Lost One*

**Trig**

Convert this equation so that it could be entered into a calculator in the standard y= format. x^2 - 4xy + 4y^2 - 8y + 2 = 0

*Tuesday, April 16, 2013 by Lost One*

**Trig**

Solve the multiple-angle equation. (Enter your answers as a comma-separated list. Let n be any integer. Enter your response in radians.) sec 9x = 2

*Monday, April 15, 2013 by Ashley*

**math**

In right triangle ABC, a = 52 ft and c = 63 ft. Which of the following trig ratios of angle B, would combine the given sides?

*Sunday, April 14, 2013 by msmith*

**Maths-trig**

Prov that 1-sin2X/sinX-cosX=sinX-cosX

*Friday, April 12, 2013 by Neo*

**trig**

an airplane has an airspeed of 430 miles per hour at a bearing of 135 degrees. the wind velocity is 35 miles per hour in the direction N30degreesE. Find the resultant speed and direction of the plane.

*Friday, April 12, 2013 by kayleigh*

**trig**

What happens when you try to elevate sin-1(3/2)?

*Thursday, April 11, 2013 by helen*

**Precalc with Trig**

What value(s) of x from 0 to 2pi solve the following equation: cos squared x - cos x - 6 = 0

*Thursday, April 11, 2013 by Natalie*

**Math**

sec(alpha) = -4(√(5))/5 find exact values at alpha for the remaining five trig functions

*Wednesday, April 10, 2013 by Tina*

**trig**

Solve rounding to 2 decimal places. 9cosx + 4cos(2x) + 1 = 0 over 0° ≤ x < 360° Thanks to anyone that can help! I'm totally stumped.

*Wednesday, April 10, 2013 by Jodi*

**Trig**

Solve exactly over 0 ≤ θ < 2π secx + tanx = 1

*Wednesday, April 10, 2013 by Lisa*

**trig**

GIVEN THE ANGEL ALFA WITH COS ALFA = -1/a. IF ALFA IN QUADRANT TWO, THE VALUE OF SIN ALFA IS....

*Wednesday, April 10, 2013 by nik*

**trig**

i need to know how to do evaerything because i am stupid

*Wednesday, April 10, 2013 by gchmhhchh*

**applied calculus**

3. a) Write out the limit definition for the derivative of y = xx. Attempt to solve it. b) Write out the limit definition for the derivative of the inverse trig function from question 2. Attempt to solve it. c) Discuss the value of implicit differentiation. (Use questions 1 ...

*Tuesday, April 9, 2013 by jack*

**applied calculus**

Let y=〖tan〗^(-1) x Rewrite it as an equation involving a trig function. Use implicit differentiation to determine an expression for y.

*Tuesday, April 9, 2013 by jack*

**Physics**

Please help! I've tried solving this with trig but I can't seem to figure out what I've been doing wrong. Two positive point charges, each of which has a charge of 2.3 × 10−9 C, are located at y = +0.60 m and y = −0.60 m. A)Find the magnitude of the resultant ...

*Tuesday, April 9, 2013 by Alex*

**Applied calculas**

3. a) Write out the limit definition for the derivative of y = xx. Attempt to solve it. b) Write out the limit definition for the derivative of the inverse trig function from question 2. Attempt to solve it. c) Discuss the value of implicit differentiation. (Use questions 1 ...

*Monday, April 8, 2013 by jack*

**Applied calculas**

Let y=〖tan〗^(-1) x Rewrite it as an equation involving a trig function. Use implicit differentiation to determine an expression for y.

*Monday, April 8, 2013 by jack*

**Trig**

Solve the equation on 0° ≤ θ < 360° and express in degrees to two decimal places. sin(2θ) = -0.7843 I've gotten 308.345° (QIV) and 231.655° (QIII). I'm unsure how to get the answer though? The final answer is: 115.83°, 295.83°, 154.17°, 334.17°. ...

*Monday, April 8, 2013 by Mary*

**trig**

I am trying to get wxMaxima to give me arcsin(4/5), either in radians or degrees. I am using a: 4/5$ b:asin(a)$ print("the angle is ", b)$ But it returns the angle is asin(4/5) How do I get wxMaxima to give me the angle? I want .927 radians or 53.1 degrees.

*Monday, April 8, 2013 by Josh*

**trig**

if sin 41'=m. write m in terms of cos 41'

*Monday, April 8, 2013 by thapelo*

**Trig**

Find the exact values of sin 2 theta, cos 2 theta and tan 2thea using the double angle formula sin theta = 3/4 , pi/2 < theta < pi

*Monday, April 8, 2013 by Jiskhaa*

**trig**

i nead to find to the nearest degree all values of theta in the interval 0 x 360 that satisfy the equation 3 cos 2 theta+ sin theta-1=0

*Sunday, April 7, 2013 by Anonymous*

**Trig**

Solve the trig equation exactly over the indicated interval. tanθ = 0, all real numbers I know the answer is πn, but I don't understand how they got this. I get that tanθ = 0 on π and 2π on the unit circle, so did they just put n on the end of π ...

*Sunday, April 7, 2013 by Anne*

**Precalc with Trig**

What value(s) of theta (0 less than or equal to theta less than or equal to 2pi) solve the following equation: cos squared theta - cos theta - 6 = 0

*Sunday, April 7, 2013 by Natalie*

**Precalculus with Trig**

Rewrite the following expression as an algebraic expression in x: cos(arcsin(x))

*Sunday, April 7, 2013 by Natalie*

**trig**

If it is given that tan(A-B)=tanA-tanB/1+tanAtanB and tanP-1/1+tanP=tan195 find p

*Saturday, April 6, 2013 by Kale*

**trig**

Indoor steps generally are steeper and have smaller landings. A staircase has a 9 inch vertical rise per step to get to the second floor of a house. If the angle of elevation is 36.8 degrees and there are 16 feet of horizontal space total for each of the landings combined, ...

*Wednesday, April 3, 2013 by Leia*

**Trig**

Sin^2 b(1 +cot^2 b) =1

*Wednesday, April 3, 2013 by Tay*

**trig**

An airplane pilot wishes to maintain a true course in the direction 250° with a ground speed of 400 mi/hr when the wind is blowing directly north at 60 mi/hr. Approximate the required airspeed and compass heading

*Monday, April 1, 2013 by Caroline*

**Trig**

Verify that each trigometric equation is an identity. 1/1-sinx + 1/1+sinx = 2 sec^2x

*Sunday, March 31, 2013 by Katelyn*

**Math: Solving Trig Equation**

9tan (x) - 9 sec^2 (x)/ tan (x)

*Sunday, March 31, 2013 by Kristi*

**Trig**

Simplify (sin^2)*(67.5deg) - (cos^2)*(67.5deg) and then evaluate exactly.

*Thursday, March 28, 2013 by Max*

**Trig**

Use a half-angle identity to find the exact value for sec(x/2) if sinx = -12/13 ; 3pi/2 < x < 2pi

*Thursday, March 28, 2013 by Anna*

**Trig**

How do I use the unit circle to evaluate tan(-3pi/4)

*Monday, March 25, 2013 by Courtney*

**trig**

Find the first two terms a_1 =5 and an=3a _n-1+2

*Sunday, March 24, 2013 by veronica*

**Trig**

prove that tanA divided by the sinA equals the secA

*Sunday, March 24, 2013 by Dominique*

**trig**

Sandra wants to find the height of a moutain. From her first location on the ground, she finds the angle of elevation to the top of the mountain to be 35 degrees 15 minutes. After moving 1000 meters closer to the moutain on level ground, she finds the elevation to be 50 ...

*Wednesday, March 20, 2013 by Anonymous*

**Trig**

If 180<A<270 and sinA= -radical(5)/3, find tan(1/2)A.

*Tuesday, March 19, 2013 by Joseph79*

**trig**

I keep trying to find the power reducing formula for sin^4(x), but I can't seem to get all the fractional parts correct. The answer I should be getting is: sin^4(x)=(1/8)cos4x-(1/2)cos2x+(3/8) I can only get this far knowing feeling confident. When I go further I start making ...

*Tuesday, March 19, 2013 by Josh*

**Math**

What is the inverse trig function cotangent of square root of 3/3? What is the value?

*Tuesday, March 19, 2013 by Bob*

**Trig**

True or False: For a trignometric function, y = f(x), then x = f^-1(y). Explain your answer. Thanks.

*Tuesday, March 19, 2013 by Clarissa*

**Trig**

True or False: For a one-to-one function, y = f(x),then x = F^-1(y). Explain your answer. Please help.

*Tuesday, March 19, 2013 by Clarissa*

**Trig**

What is the exact value of tan(s+t) if sin(s+t)=56/65. And cos(s)=5/13 and sin(t)=4/5. Everything is in the first quadrant

*Tuesday, March 19, 2013 by Heather*

**Trig**

A pulley with a diameter of 24 inches is driven by a belt which is moving 1045 ft/min. How many revolutions per minute are made by the pulley?

*Tuesday, March 19, 2013 by Katelyn*

**Trig**

How do I find the exact value of sin (pi/24)?I am crying

*Sunday, March 17, 2013 by Luis*

**trig**

How do I find the exact value of sin (pi/24)?

*Sunday, March 17, 2013 by Luis*

**Trigonometry**

Hi, I really need help in understanding how to solve trig equations. How do you solve this equation? Solve the equation on the interval 0 < or equal to x < or equal to 2pi. sinx = (square root of 3)/2 I appreciate your help. Thank you!

*Sunday, March 17, 2013 by Leah*

**trig**

A pole is braced with a wire from the top of a pole to the ground. The wire is 100 feet long and makes an angle of 40° with the ground. Find the height of the pole.

*Friday, March 15, 2013 by Anonymous*

**trig**

A road runs from the base of a mountain. From two points 235 meters apart on the road, the angles of elevation to the top of the mountain are 43 and 30. how high above the road is the mountaintop?

*Wednesday, March 13, 2013 by nicole HELP*

**trig**

A road runs from the base of a mountain. From two points 235 meters apart on the road, the angles of elevation to the top of the mountain are 43 and 30. how high above the road is the mountaintop?

*Wednesday, March 13, 2013 by nicole*

**trig**

A road runs from the base of a mountain. From two points 235 meters apart on the road, the angles of elevation to the top of the mountain are 43 and 30. how high above the road is the mountaintop?

*Wednesday, March 13, 2013 by nicole*

**trig**

cos è = 0.9659 A = ? H = 20

*Wednesday, March 13, 2013 by ben*

**Trig**

a. Form a pair of simultaneous equations by letting y1 equal the left side and y2 equal the right side of sqrt 5-x=1. b.Repeat part (a) with the equivalent equation sqrt 5=x+1 c. Repeat part (a) with the equivalent equation sqrt 5-x-1=0

*Tuesday, March 12, 2013 by Lavanda*

**Trig**

Whats the height of a flagpole if a student stand 37feet from it and determines the angle of elevation to be 34degrees and her eyes are 5.3 feet from the ground(round to the nearest whole number)

*Monday, March 11, 2013 by David*

**Trig**

the number of solutions of sin x= -sqrt3/2 for x between 0 and 2pi

*Monday, March 11, 2013 by David*

**Trig**

the height of a flagpole if a student stands 37 feet from it and determines the angle of elevation to be 34 degrees and her eyes are 5.3 feet from the ground.

*Monday, March 11, 2013 by David*

**trig**

The radian measure of an angle of 182 degrees is ?

*Wednesday, March 6, 2013 by tyler*

**trig**

use an angel sum identity to verify cos2theta = -2cos^@-1

*Monday, March 4, 2013 by cooper roschuk*

**Trig**

help please!: (sinx + sin2x +sin3x) / (cosx + cos2x + cos3x) = tan2x

*Sunday, March 3, 2013 by Aiden*

**trig**

cos(2x+4h)-cos(2x+2h)=?

*Sunday, March 3, 2013 by Anonymous*

**trig**

cos(2x+4h)-cos(2x+2h)=?

*Sunday, March 3, 2013 by Anonymous*

**trig**

cos(2x+4h)-cos(2x+2h)

*Sunday, March 3, 2013 by Anonymous*

**Trig**

A plane if flying at 200 mph with a heading of 45 degrees and encounters a wind of 100 mph from the west. What is the resulting velocity and heading?

*Sunday, March 3, 2013 by Sarah*