Wednesday

September 2, 2015
**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*

**trig**

53. A 60-foot drawbridge is 24 feet above water level when closed. When opened the bridge makes an angle of 33 degrees with the horizontal. a. How high is the tip P of the open bridge above the water? b. When the bridge is open, what is distance from P to Q? 53. A 60-foot ...
*Friday, February 17, 2012 by Anonymous*

**trig**

how to graph y = 1/2 cos 2x for 0 ≤ x ≤ 2 p
*Thursday, February 16, 2012 by tori*

**Trig**

what is the amplitude, period, phase shift, and vertical shift of each equation? 1. y= A cos(B(x-3))+4 2. y=-2sin(2piX/3) 3. y=4cos(3pi(x+3)) 4. y= -3cos(2(x-pi/4))+0.4 thank you so much!
*Thursday, February 16, 2012 by BreAnne*

**trig**

Describe the possible values of variable a such that (/72) + (/a) can be simplified to a single term. Note: (/a) is the square root of a.
*Wednesday, February 15, 2012 by cheyanne*

**trig**

Prove 1+cos X/1-cos X = (csc X + cot X)squared
*Wednesday, February 15, 2012 by Emmie*

**Algebra-Trig Please Help ASAP**

A balloon isin the vertical plane of two consecutive milestones of a road. The angles of depression of the stones as viewed from the balloon are 15 degrees and 17 degrees. Find the height of the balloon if (a) the stones are on opposite sides of the balloon, (b) the stones are...
*Wednesday, February 15, 2012 by Candy*

**trig**

cos^4 15-sin^4 15 with out using calculator
*Wednesday, February 15, 2012 by mohamed sedeeq*

**trig**

If cosecant of theta equals 3 and cosine of theta is less than zero, find sine of theta, cosine of theta, tangent of theta, cotangent of theta and secant of theta
*Wednesday, February 15, 2012 by Ana *

**trig**

from an observer tower, a ff.above the level of a river,the angle of depression of a point on the near shore is theta and that of a point directly beyond on the far shore is FI. show that the width of the river is a (cotan theta=p+q/r)
*Wednesday, February 15, 2012 by Anonymous*

**trig**

right triangle has an acute angle of 24.8 and an adjacent length of 145 what is the side opposite of the acute angle
*Tuesday, February 14, 2012 by lo*

**trig**

refer to right triangle ABC with C = 90degrees. Given a= 2 and b=√5 Find the six trigonometric functions of A. and find the angles A and B
*Monday, February 13, 2012 by Mari*

**Math [Trig]**

how do you find a full cycle of a trigonemtric function?
*Monday, February 13, 2012 by Cody*

**trig**

CSC(theta)=1.92 Find Theta. Now I know CSC = 1/sin but no matter how I enter it into my cal I get an error.
*Monday, February 13, 2012 by Zero*

**Algebra/Trig Check Answers please **

Please check these answers thanks. 1. The shadow of a vertical pole is 24.8 feet long when the angle of elevation of the sun is 42degrees 0.0'. Find the height of the pole. Answer: 22.3=height 2. From a point on a lighthouse 108 feet above water, the angle of depression of...
*Saturday, February 11, 2012 by Missy*

**Algebra/Trig Check Answers please **

Can you please check these answers thanks 1. A ladder 14 feet long is leaning against a house. The foot of the ladder is 4.8 feet from the house. Find the angle of elevation of the ladder and the height it reaches on the house. Answer: 13.2=height 18.9 =angle of elevation 2. ...
*Saturday, February 11, 2012 by Missy*

**Math/trig**

Log radical b/ a^2 is equivalent to 1) 1/2 log b + 1/2 log a 2) l/2 log b- 2 log a 3) 2 log b - 1/2 log a 4) 1/2logb/2 log a
*Saturday, February 11, 2012 by matthew*

**Math/Trig**

Which logarithmic equation is equivalent to L^m = E 1) LogL E = m 2) logE L = m 3) logm E= L 4) logE m= L
*Saturday, February 11, 2012 by Charles*

**trig**

The hypotenuse of the right triangle PQR is 16ft. length. The sine of the angle <P is 3/5. How many feet long is the line if QR?
*Saturday, February 11, 2012 by Aailayah*

**trig**

If theta is an angle in standard position, state in what quadrants its terminal side can lie if theta is equal to -415 degrees?
*Friday, February 10, 2012 by Rick*

**TRIG**

In a right triangle ABC, C = 90°, b = 380.1 inches and c = 589.1 inches. Solve for all the missing parts using the given information. (Round each answer to one decimal place for side and to two decimal places for angles.) A = ° B = ° a = inches IM lOST!
*Friday, February 10, 2012 by Anonymous*

**trig**

I dont understand this. can you please tell how you got each answer? describe how the graph of each function is related to a basic trigonometric graph. 1. y= 1/2cos x 2. y= 2cos x+1 3. y= sin x-4 4. y= sin(x-4) 5. y= sin(3x) 6. y= cos(1/2x) 7. y= -cos x 8. y= -cos x+2 9. y= -...
*Friday, February 10, 2012 by BreAnne*

**trig**

if diameter of the circle is 100 cm. and length of the arc forming the angle is 360 cm. Assume that the earth is a perfect sphere of diameter 8000 miles. Find the distance between: Rome, Italy: latitude 42 degrees north Copenhagen, Denmark: latitude 54.3 degrees north
*Wednesday, February 8, 2012 by sara*

**trig**

Find sin t,cos t and tan t when the terminal side of an angle of t radians passes through ( -3/5 , -4/5) on the unit circle.
*Wednesday, February 8, 2012 by emily*

**trig**

Find sin t ,cos t and tan t when the terminal side of an angle of t radians passes through (2 , 7)
*Wednesday, February 8, 2012 by Nora*

**trig**

Find sin t ,cos t and tan t when the terminal side of an angle of t radians passes through (2 , 7)
*Wednesday, February 8, 2012 by Nora*

**trig**

Given theta is in the standard position and is in the first quadrant , if the terminal side of the angle theta is parallel to the line y=x+4 on ,find the measure of theta in degrees.
*Wednesday, February 8, 2012 by Nora*

**trig**

Given theta is in the standard position and is in the first quadrant , if the terminal side of the angle theta is parallel to the line on ,find the measure of theta in degrees.
*Wednesday, February 8, 2012 by Stacy*

**trig**

Solve the equation 2 tan C - 3 = 3 tan C-4 algebraically for all values of C in the interval 0 degrees <_ C < 360 degrees
*Wednesday, February 8, 2012 by Anonymous*

**trig**

If the value of sin theta =12/13 then find the value of 1-cos theta/1+cos theta.
*Wednesday, February 8, 2012 by Animesh*

**Trig**

If sin(t)=4/5 & 0<t<pi/2, find the following: a)sin t(-t) b) sin(t-2pi) c)cos t d)cos(pi-t)
*Wednesday, February 8, 2012 by Purplechick4*

**Trig**

if tan(x)=9/4, find cos(x) if pi<x<3pi/2
*Wednesday, February 8, 2012 by Purplechick4*

**Trig**

Help please! Thank you! If csc(theta)= -2 and theta lies in Quadrant III, find tan(theta).
*Tuesday, February 7, 2012 by Mandy*

**trig**

if (0,-7) lies on the terminal side of angle theta in standard position, find each value sec(theta) , cot(theta) and sin(theta)
*Monday, February 6, 2012 by Laura*

**TRIG HELP ASAP**

I really need help on this problem. A sector has area of 15 in^2 and central angle of 0.2 radians. Find the radius of the circle and arc length of the sector
*Monday, February 6, 2012 by missy*

**Geometry/trig**

A plane is flying due south at a speed of 300 mph. The wind is blowing from the west at a speed of 40 mph. Find the resultant speed of the plane and the direction of the plane
*Monday, February 6, 2012 by Lezah*

**trig**

tan theta= square root of 3 / 3 if o degrees is less than or equal to theta less than o equal to 360
*Monday, February 6, 2012 by Dillon*

**Calculus**

Integrate [1/square root of(e^(2x)-1)]. I have to use u substitution. We are doing the integrals of inverse trig functions, but I cannot get it to work out!
*Sunday, February 5, 2012 by Elaine*

**trig**

A race driver has a pit stop to refuel. After refueling, he starts from rest and leaves the pit area with an acceleration whose magnitude is 5.5 m/s^2; after 3.6 s he enters the main speedway. At the same instant, another car on the speedway and traveling at a constant ...
*Sunday, February 5, 2012 by Anonymous*

**trig**

If tan theta = sin theta, and theta is greater than or equal to 0 and less than or equal to 2 pi. find cos theta and what is theta
*Saturday, February 4, 2012 by Anonymous*

**trig**

What is the domain, range, and period of y= sin x + 1 What is the domain, range, and period of y= -cos x Can someone please help?
*Friday, February 3, 2012 by BreAnne*

**Trig**

can you please simplify these in faction form? (pi/3) +1=? (2pi/3) +1=? (3pi/4) +1=? (5pi/4) +1=? (5pi/3) +1=? thank you so much!
*Friday, February 3, 2012 by BreAnne*

**Trig**

a. What is the length of the hypotenuse of triangle ABC? b. What is the length of the shorter leg of triangle ABC? c. What is the length of the longer leg of triangle ABC? angle A=60, angle B=30, angle C=90 the triangle has a height of 10
*Friday, February 3, 2012 by BreAnne*

**trig**

use the discriminant to solve for the smallest value of b that would make the roots of the equation x^2+bx+5=o imaginary
*Thursday, February 2, 2012 by jessica*