Tuesday

December 1, 2015
**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 dont 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 ...
*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...
*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 ...
*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*

**TRIG/ALGEBRA**

1) Find the exact value. Use a sum or difference identity. tan (-15 degrees) 2) Rewrite the following expression as a trigonometric function of a single angle measure. cos 3x cos 4x - sin 3x sine 4x
*Friday, February 24, 2012 by cheyanne*

**Pre- Calculus**

Evaluate the trig function tan33degress
*Thursday, February 23, 2012 by Steve*

**trig**

does sec(x)tan(x)*tan(x)=[sec(x)(tan^2)x]
*Thursday, February 23, 2012 by Drew*

**trig**

sin(x) = 8/17 and 90 degrees < x < 180 degrees then find cos2(x)
*Thursday, February 23, 2012 by Harley *

**Trig (Last URGENT)**

sin2x+cosx=0 , [-180,180) = 2sinxcosx+cosx=0 = cosx(2sinx+1)=0 cosx=0 x1=cos^-1(0) x1=90 x2=360-90 x2=270 270 doesn't fit in [-180,180) what do I do? Or maybe I did something wrong. sinx=1/2 x1=sin^-1(1/2) x1=30 x2=180-30 x2=150 is this correct? Please and Thank you
*Wednesday, February 22, 2012 by Anonymous*

**Trig Help (URGENT)**

Solve over the indicated interval: 2sin^2x=sqrt2sinx , [-180,180) don't how to get x by itself please help and thank you
*Wednesday, February 22, 2012 by Anonymous*

**Trig Help**

Given that cos2x=7/12 and "270 equal or < 2x equal or < 360", find sinx. Please help and Thank you
*Wednesday, February 22, 2012 by Anonymous*

**trig**

please help me with some questions I skipped on a review for our test coming up? solve 5-7 on the interval 0 greater than or equal to x less than or equal to 2pi. 5. sin x=sqrt3/2 6. cos x=-1/2 7. tan x=0 ---------------- 14. what is the exact value of tan[arcsin(.43...
*Wednesday, February 22, 2012 by BreAnne*

**trig**

John weighed five rocks two at a time in all possible ways. The weights in pound are 30,38,41,42,45,46,50,53,58,61. How much does each rock weigh?
*Wednesday, February 22, 2012 by pc*

**trig**

How king i find theta if the formula is cot(2theta) = 7/24?
*Wednesday, February 22, 2012 by Isai*

**trig**

The angle of elevation to the top of a very tall Building is found to be 9° from the ground at a distance of 1 mi from the base of the building. Using this information, find the height of the building.
*Tuesday, February 21, 2012 by Princy*

**trig**

The angle of elevation to the top of a very tall Building is found to be 9° from the ground at a distance of 1 mi from the base of the building. Using this information, find the height of the building.
*Tuesday, February 21, 2012 by Princy*

**Trig**

#1 (1/sinx)(sin^2x + cos^2x(sinx/cosx) )/(sinx + cosx) = (sinx + cosx)/(sinx+cosx) = 1 Reiny helped with this question but I don't how Reiny did it. Please explain
*Tuesday, February 21, 2012 by Anonymous*

**Trig **

3-square root 2/ 1+square root 2
*Tuesday, February 21, 2012 by Jay C*

**precalc/trig help please**

The area of a circle is 18pi square meters. What is the radius (leaving answer in simplest radical form)
*Tuesday, February 21, 2012 by Carlee'*

**trig**

Since cot x = cos x / sin x, if cot x = 1/2, with the angle x in the first quadrant, then cos x = 1 and sin x = 2 (1) State true or false. Is this a possible situation? (2) If false, explain why.
*Monday, February 20, 2012 by Anonymous*

**trig**

The minute hand of a clock is 6 inches long. What distance does its tip move in 16 minutes?
*Monday, February 20, 2012 by tim*

**trig**

evaluate tan(51 degree 15')+cot(25 degrees 18')
*Monday, February 20, 2012 by Anonymous*

**trig**

y= sin x/2, 0 less than equal to x less than equal to 4pi... the question says state the amplitude and period for each equation and graph it over the indicated interval
*Sunday, February 19, 2012 by jim*