# Homework Help: Math: Trigonometry

## Recent Homework Questions About Trigonometry

**trig**

verify that 2/1+cos theta - tan squared (theta/2) = 1

*Monday, March 19, 2012 by jake*

**trig e-maths**

giving that cosx=4/5 and siny=12/13, find cos(x+y) when x is acute and y is obtuse angle

*Sunday, March 18, 2012 by edward damia*

**trig**

a plane takes off at 10.00am from an airfield, and flies at 120km/h on a bearing of N35W. A second plane takes off at 10.05am from the same airfield, and flies on a bearing of S80E at a speed of 90km/h. How far apart are the planes at 10.25am?

*Sunday, March 18, 2012 by Anonymous*

**trig**

Find the general solution for x if cos2x + sin3x = sinx

*Sunday, March 18, 2012 by Tiana*

**inverse trig HELP PLEASE!!**

Write the general solution to y = arcsin (0.6428). 40°±360°k 140°±360°k 220°±360°k 320°±360°k How do I find the right answer? I am like seriously stuck. I need help please.

*Sunday, March 18, 2012 by Adrianna*

**trig**

In a computer simulation, a satellite orbits around Earth at a distance from the Earth's surface of 2.1 X 104 miles. The orbit is circular, and one revolution around Earth takes 10.5 days. Assuming the radius of the Earth is 3960 miles, find the linear speed (velocity) of the ...

*Saturday, March 17, 2012 by John*

**trig**

solve for theta 6. tan theta=-1 7. sin(theta/2)=1/2 thank you for your help!

*Saturday, March 17, 2012 by BreAnne*

**trig**

when sin theta+cos theta=square root of 2,find the solution of sin^3 theta+cos^3 theta

*Saturday, March 17, 2012 by joan*

**Algebra-Trig help asap**

A rhombus has sides of 5 cm each and one diagonal is 6 cm long. Find the area of the rhombus.

*Tuesday, March 13, 2012 by Missy*

**Math:Trig.!!!!**

You (safely) bungee jump from a 200-feet tall bridge in your town. Your distance above the water's surface depends on the time since you jumped. Sketch a reasonable graph.

*Monday, March 12, 2012 by Claries*

**trig**

solve the equation 2 tan C-3=3 tan X-4 algebraically for all values of C in the interval odegrees lessthan or equal C lessthan360 degrees.

*Monday, March 12, 2012 by Anonymous*

**Trig-Algebra help asap**

A regular octagon is inscribed in a circle with a radius of 5 cm. Find the area of the octagon.

*Monday, March 12, 2012 by Missy*

**Trig-Algebra help asap**

A regular pentagon is inscribed in a circle whose radius measures 7 cm. Find the area of the pentagon.

*Monday, March 12, 2012 by Missy*

**Trig-Algebra help asap**

A rhombus has sides of 5 cm and one diagonal is 6 cm long. Find the area of the rhombus.

*Monday, March 12, 2012 by Missy*

**Trig-Algebra help asap**

The adjacent sides of a parallelogram measure 8 cm and 12 cm and one angle measures 60 degrees. Find the area of the parellelogram.

*Monday, March 12, 2012 by Missy*

**trig**

SOlve over (2,pie) and find the general solution in radians. 2sin3x = square root of 2

*Monday, March 12, 2012 by Leigh*

**trig**

5sin(2x)+4cos(x)=0

*Monday, March 12, 2012 by john*

**trig**

5sin(2x)+4cos(x)+0

*Monday, March 12, 2012 by john*

**trig**

cos x/1+sin x + 1+sin x/ cos x= 2sec x

*Monday, March 12, 2012 by val*

**trig**

verify the identity algebraically- (5-5 cos x)(5+5 cos x)=25 (sin^x)

*Monday, March 12, 2012 by cam*

**Trig Help**

Prove the following: [1+sinx]/[1+cscx]=tanx/secx =[1+sinx]/[1+1/sinx] =[1+sinx]/[(sinx+1)/sinx] =[1+sinx]*[sinx/(sinx+1)] =[sinx+sin^2x]/[sinx+1] =[sinx+(1-cos^2x)]/[sinx+1] =??? This is where I'm stuck. Can someone help me. Please check what I got is right so far it's ...

*Sunday, March 11, 2012 by Anonymous*

**trig**

City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?

*Sunday, March 11, 2012 by Janet*

**trig**

City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?

*Sunday, March 11, 2012 by Janet*

**trig**

City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?

*Sunday, March 11, 2012 by Janet*

**trig**

If sec theta = radical 5, what is the exact value of cos theta

*Sunday, March 11, 2012 by Dan*

**trig**

If sec theta = radical 5, what is the exact value of cos theta

*Sunday, March 11, 2012 by Dan*

**trig**

A ship sails 40 miles SOUTH and 15 miles EAST. Find the bearing from where it began? HELP.

*Sunday, March 11, 2012 by Chloee*

**trig or geom**

i have to use pythagorean theorem to find the leg-measure of x. in the formula, x would be a^2. the hypotenuse is 11 and "b" is unknown. there is also a cosine with a measure of .4 at the top-most angle.. what is x? i don't know how to use cosine with the problem

*Sunday, March 11, 2012 by starlight18*

**Trig.**

finnd a possible measure of the angle drawn in standard position that passes through the points (ã2,-ã2)

*Sunday, March 11, 2012 by John*

**calculus**

find max, min and saddle points of the give function f(x,y)=sin(x)+sin(y)+sin(x+y) 0<=x<=pi/4 0<=y<=pi/4 i have that dz/dx=cos(x)+cos(x+y) dz/dy=cos(y)+cos(x+y) and i set them equal to zero but im kinda confused on how to really solve that. i mean i got an answer ...

*Friday, March 9, 2012 by Help Please*

**Geometry/trig**

A ladder, 17 feet long, leans against a wall at a 49 degree angle to the ground. How far up the wall does the ladder reach?

*Friday, March 9, 2012 by Leana*

**trig**

Find all angles in degrees that satisfy the equationtan∝ +√3=0

*Friday, March 9, 2012 by Anonymous*

**Trig**

If CSC X = 4 in the quadrant 1, what is COS X?

*Friday, March 9, 2012 by April*

**Alg 2 trig**

Write a sine equation for period= pie, amplitude=1/2, vertical shift up 1 and phase shift left pie/4. How would the equation be written?

*Friday, March 9, 2012 by Nicole*

**trig**

what is the exact value of cos(x+y) if tan=x sqare root 3 over 3 and sin y=square root 2 over 2?

*Thursday, March 8, 2012 by ebonee*

**Trig**

How do you do this? 1-sin^2x/csc^2 x-1

*Thursday, March 8, 2012 by Alicia*

**Trig**

HELP!!!! I don't know how to do the trig identity with this problem csc^4 x-cot^4x= Csx^2 x + cot^2x

*Thursday, March 8, 2012 by Quetzally*

**trig**

Simplify the expression cos^2 x (sec^2 x-1)

*Thursday, March 8, 2012 by Ruby*

**Trig Proofs!**

I'm having trouble solving this proof. Can you help? cos^3+sin^3/cosx+sinx = 1-sinxcosx Thanks!:)

*Thursday, March 8, 2012 by Kels.*

**trig**

solve each equation for è, giving a general formula for all of the solutions: 6. tanè=-1 7. sin(è/2)=1/2 Please show step by step on how to solve these. Im not sure on how to do them. Thank you for your help!

*Wednesday, March 7, 2012 by BreAnne*

**trig.**

A ladder 20 feet long leans against the side of a house. Find the height from the top of the ladder to the ground if the angle if the angle of elevation of the ladder is 80°

*Wednesday, March 7, 2012 by julie*

**trig.**

A ladder 20 feet long leans against the side of a house. Find the height from the top of the ladder to the ground if the angle if the angle of elevation of the ladder is 80°

*Wednesday, March 7, 2012 by julie*

**trig**

if sin a=4/5 and is quadrant 2 and sin b= 8/17 and is in quadrant 1, find cos (a-b)

*Wednesday, March 7, 2012 by Lizaine*

**trig**

16. Let W(ƒá ) be a point in Quadrant I on the unit circle with center O. W(ƒá )B is perpendicular to the x-axis at B, OB = 0.6. and W(ƒá )B ƒ 0.8. Find:

*Tuesday, March 6, 2012 by Anonymous*

**Pre-Cal**

given the function y=2sin3x-1, identify the following below. also show its graph for the primary cycle. (identifying parts of a trig. equation) asymptotes= k= c= axis= primary cycle= period=

*Tuesday, March 6, 2012 by Kim*

**ALG/TRIG**

I cannot seem to get the right answer. Animal Pulse Rate According to one model, an animal’s heart rate varies according to its weight. The formula N(w)=885w^-1/2 gives an estimate for the average number N of beats per minute for an animal that weighs w pounds. Use the ...

*Tuesday, March 6, 2012 by Lost*

**ALG/TRIG**

Lost is an understatement..please help me understand this. Orbits and Distance Johannes Kepler (1571–1630)discovered a relationship between a planet’s distance D from the sun and the time T it takes to orbit the sun. This formula is , where T is in Earth years and ...

*Tuesday, March 6, 2012 by Lost*

**Trig**

Please help. I can't get this problem at all. When two bubbles cling together in midair their common surface is part of a sphere whose center D lies on the line passing through the centers of the bubble. Also, angles ACB and ACD are 60 degrees. Show that the radius r of the ...

*Monday, March 5, 2012 by HELP*

**Trig**

Prove sin(α+β)sin(α-β)=cos^2β-cos^2α

*Monday, March 5, 2012 by Katie*

**Trig**

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?

*Monday, March 5, 2012 by Katie*

**Trig**

Prove cos^2t+4cost+4/cost+2=2sect+1/sect

*Monday, March 5, 2012 by Katie*

**Trig**

Prove (3cosθ-4sinθ)^2+(4cosθ+3sinθ)^2=25

*Monday, March 5, 2012 by Katie*

**Trig**

Prove sin(α+β)sin(α-β)=cos^2β-cos^2α

*Monday, March 5, 2012 by Katie*

**Trig**

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?

*Monday, March 5, 2012 by Katie*

**Trig**

Prove cos^2t+4cost+4/cost+2=2sect+1/sect

*Monday, March 5, 2012 by Katie*

**trig**

Q1: Prove cos^2t+4cost+4/cost+2=2sect+1/sect Q2: A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?

*Monday, March 5, 2012 by Katie*

**Trig**

Prove cos^2t+4cost+4/cost+2=2sect+1/sect

*Monday, March 5, 2012 by Kathryn*

**Trig**

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?

*Monday, March 5, 2012 by Kathryn*

**Trig**

prove sin(α+β)sin(α-β)=cos^2β-cos^2α

*Monday, March 5, 2012 by Kathryn*

**geom/trig**

A 40 ft ladder leans against a wall so the base of the ladder is 11 feet away from the base of the wall . What angle does the ladder make with the wall?

*Monday, March 5, 2012 by Tom*

**Trig**

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?

*Monday, March 5, 2012 by Unkown*

**Trig**

prove sin(α+β)sin(α-β)=cos^2β-cos^2α please help... this is the only one I didn't understand out of all my homework...

*Monday, March 5, 2012 by Katie*

**Trig**

prove sin(α+β)sin(α-β)=cos^2β-cos^2α

*Monday, March 5, 2012 by K.T.*

**trig**

if sin 7x = cos x+10 find the value of x

*Monday, March 5, 2012 by Anonymous*

**trig**

find the general solutions to the equations: 1) sec x = -2 2) 2 sin^2 x = 1 3) cos^2 x - 2cos x + 1 = 0

*Monday, March 5, 2012 by jenny*

**trig**

if cot(x-10)=tan(4x) what does x equal?

*Sunday, March 4, 2012 by Ali*

**trig**

Verify the trigonometric identity. Please show all steps. tanx-cotx/tanx+cotx=sin^2x-cos^2x

*Sunday, March 4, 2012 by garrett*

**Trig**

(cos^2t+4cos^2+4)/(cost+2)=(2sect+1)/sect

*Saturday, March 3, 2012 by Katie*

**Trig**

Prove (cos^2t+4cos^2+4)/(cost+2)=2sect+1)/sect

*Saturday, March 3, 2012 by Katie*

**Trig**

prove(sinx/cosx+1)+(cosx-1/sinx)=0 Please help asap!!!!! PLEASE

*Saturday, March 3, 2012 by Katie*

**Trig**

prove (cscx-secx/cscx+secx)=(cotx-1/cotx+1)

*Saturday, March 3, 2012 by Bud*

**Trig**

prove(sinx/cosx+1)+(cosx-1/sinx)=0

*Saturday, March 3, 2012 by Katie*

**trig**

y=25sin(120t-4x) what is the wave length what is the speed

*Saturday, March 3, 2012 by Sylvia Oni*

**trig and geometry**

bernhardt and julia are observing an eagles nest in a tree. Julia is 75m from the tree, and sees it at an angle of elevation of 42 degrees A)How high up the tree is the nest B)Bernhardt is standing 30m behind julia. At what angle of elevation does he see the nest?

*Friday, March 2, 2012 by joey*

**trig**

Which expression is equivalent to cos(4x) + cos(2x)?

*Thursday, March 1, 2012 by Anonymous*

**trig**

bernhardt and julia are observing an eagles nest in a tree. Julia is 75m from the tree, and sees it at an angle of elevation of 42 degrees A)How high up the tree is the nest B)Bernhardt is standing 30m behind julia. At what angle of elevation does he see the nest?

*Thursday, March 1, 2012 by Math*

**Trig FInd Translation Rule and Coordinates Thanks!**

The vertices of a rectangle are R(–5, –5), S(–1, –5), T(–1, 1), and U(–5, 1). After translation, R' is the point (–11, –11). Find the translation rule and coordinates of U'. (x, y)--> (x – 6, y + 6); (–11, 7) (x, y)--> (x – 6, y – 6); (–11, –5...

*Thursday, March 1, 2012 by LeXi ;)*

**Trig**

A pilot is flying over a straight highway. He determines the angles of depression to two mileposts, 3 mi apart, to be angle x = 31° and angle y = 49°, as shown in the figure. (Round your answers to two decimal places.) Find the distance of the plane from point A. Find the ...

*Wednesday, February 29, 2012 by Dan*

**trig**

Find the value of theta (in radians) corresponding to the point (6,-8)

*Wednesday, February 29, 2012 by Brandon*

**Trig**

When two bubbles cling together in midair their common surface is part of a sphere whose center D lies on the line passing through the centers of the bubble. Also, angles ACB and ACD are 60 degrees. Show that the radius r of the common face is given by r=ab/a-b.

*Wednesday, February 29, 2012 by blondie*

**trig**

8cos6xsin6x

*Wednesday, February 29, 2012 by raphael*

**trig**

Expan each of the following using the compound-angle formulae:sin(x + 20degree)

*Wednesday, February 29, 2012 by Zama*

**Trig**

Use a calculator to find θ to the nearest tenth of a degree, if 0° < θ < 360° and csc(θ)=1.4307 with θ in QII θ=?

*Tuesday, February 28, 2012 by Ben*

**trig**

in this right trianlge ABC, m<c=90, m<a=63, and AB=10. if BC is represented by a, then which equation can be used to find a?

*Tuesday, February 28, 2012 by Beth*

**trig**

solve for x log4 64+ log2 2 ________________ =x log3 81

*Tuesday, February 28, 2012 by Beth*

**math/cal/trig solve for t**

solve for t: 0=4sin(2t)cos(2t)-sin(2t)

*Monday, February 27, 2012 by Lucy*

**trig**

Tan(cos inverse 5x)

*Monday, February 27, 2012 by ARIK*

**trig**

Choose the percent increase or decrease for the before and after measurements: 12 (before) and 12 (after) a) not given b) increase of 30% c) decrease of 25% d) increase of 25%

*Monday, February 27, 2012 by Rosa*

**trig**

Name three values of theta that would result in y equal to cot times theta being undefined.

*Monday, February 27, 2012 by scott*

**tRiG/ AlGeBrA**

1) Use double-angle identities to write the following expression, using trigonometric functions of x instead of 4x. cos 4x 2) Use half-angle identities to write the following expression, using trigonometric functions of x instead of x/4. sin x/4

*Monday, February 27, 2012 by CHEYANNE*

**Math/Trig**

Period: Asymptotes: Range: a) y= 2 sec (x) + 1 b) y= -2 csc (x - pi/2) c) y= 1 + tan (x + pi/4) d) y= 1/2 + csc (x - pi) + 1 e) y= cot (3x + pi) + 2 Any tips on drawing the graph?

*Sunday, February 26, 2012 by Krystal*

**trig**

sin [sin -1 (7/25) - cos -1 (-8/17)]

*Sunday, February 26, 2012 by Ansley*

**trig**

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 trigonometric functions of t whenever possible. 2pi 3pi/4 5pi/6 Three questions. I think those are supposed to be t.

*Sunday, February 26, 2012 by Carter*

**geometry**

In parallelogram TRIG, m∠R = 2x + 19 and m∠G = 4x - 17. What is m∠T

*Sunday, February 26, 2012 by miguel*

**trig**

Solve for x if sin2x=cos(x+60 and x€ [-90,180].show all work details

*Sunday, February 26, 2012 by please help now*

**trig**

If csc theta = 2, then what is theta approximated to 4 decimal points? RADIANS

*Sunday, February 26, 2012 by Carter*

**trig**

1.Ifg(x)=cos4x,find g'(pie/24). 2.Differentiate y=csc^2 pie*x

*Saturday, February 25, 2012 by albert*

**college Calculus Help!**

Find the derivative of the function. 1. F(x)= (1+2x+x^3)^1/4 2. f(t)= (1+tant)^1/3 ---> i hate trig. 3. y=4sec5x 4. y=xsin√x

*Saturday, February 25, 2012 by dania*

**college Calculus Help!**

Find the derivative of the function. 1. F(x)= (1+2x+x^3)^1/4 2. f(t)= (1+tant)^1/3 ---> i hate trig. 3. y=4sec5x 4. y=xsin√x

*Saturday, February 25, 2012 by dania*

**Precal**

Write down 3 other possible trig forms for - 1 + isqrt2. How do you solve this?

*Saturday, February 25, 2012 by Mayhem*