Monday

February 20, 2017
Number of results: 4,008

**Pre-Cal**

[Note: I'm still having issues with identities with regard to trig] Verify the Trig. identities: (a). cot(x+y)=(cotxcoty-1)/(cotx+coty) (b). sin0(cot0+tan0)=sec0 [Note: 0=theta symbol]

*July 11, 2016 by Amber*

**Trig**

How do you express sin4x as a trigonometric funcition of x using the identities? I think that you are supposed to start with the sine sum identity and then use the double angle identities for sin2A and cos2A, but after that I get stuck...

*February 17, 2010 by Taylor*

**Precalculus**

How would you solve this trig function: cos2x=sin^2-2 how do you know what trig identities to use?

*August 6, 2011 by Jess*

**trig**

TRIG Identities, Gr. 12: Prove: cot4x=1-tan^2x/2tan2x

*May 23, 2013 by Josh*

**trig**

Let Q be an acute angle such that sinQ=.6. Find the values of the following using Trig Identities: cosQ and tanQ

*July 27, 2010 by student*

**Trig**

Use Trig identities to verify that sec^4(x)-tan^4(x)=1+2tan^2(x), Only work with one side of the equation

*March 1, 2011 by Anonymus*

**Trig**

Are any of these three problems identities? 1. Cos^2x-sin^2x=1-2sin^2x 2. Sinxsecx=cosxcscx 3. Sec^4x-tan^4/sec^2x=1+sin^2x If so, how can you conclude that any of them are identities?

*January 3, 2010 by Melody*

**Trig**

Are any of these three problems identities? 1. Cos^2x-sin^2x=1-2sin^2x 2. Sinxsecx=cosxcscx 3. Sec^4x-tan^4/sec^2x=1+sin^2x If so, how can you conclude that any of them are identities?

*January 3, 2010 by Melody*

**Trigonometry**

Use the trig Identities to find the other 5 trig functions. Problem 7.)Tan(90-x)=-3/8 8.)Csc x=-13/5 9.)Cot x=square root of 3 10.)Sin(90-x)=-.4563 11.)Sec(-x)=4 12.)Cos x=-.2351 I need HELP!

*January 5, 2010 by Jennifer*

**Trig**

Im having serious issues with verifying Trig. identities. Please help! Here is an example: (tanX-secX)^2= 1-sinX/1+sinX

*November 7, 2011 by Rachel*

**trig**

Solving Trig Functions: How Do You Solve For Sin 7.5 Using Half-Angle and Double-Angle Identities?

*September 22, 2010 by Spy[c]*

**trig**

2sin(4x)[(cos(3/2)x)(cos(5x/2)-sin((15/4)x)]+x can someone simplify this using trig identities?

*May 13, 2012 by Brianna*

**Trig Identities**

Please help...I'm not understanding trig identities and how to manipulate and express these two problems in their associated functions. Thanks a)Express as a function of cos (theta) 2 sin^2(theta) - 1 b)Express as a function of sin (theta) or cos (theta) tan^2(theta) - 2 sec(...

*January 6, 2009 by Donovan*

**Trig identity.**

I need help with verifying these trig identities: 1) sin4x = 4sinxcos - 8sin^3 x cos x 2) cos3x = cos^3 x - 3sin^2 x cos x

*March 15, 2016 by Jane*

**Trigonometry - Identities and proof**

Show that cot((x+y)/2) = - (sin x - sin y)/(cos x - cos y) for all values of x and y for which both sides are defined. I tried manipulating both sides in terms of trig identities but I don't really have a solution....help would be appreciated, thanks.

*November 13, 2013 by Sam*

**Trig Identities**

Prove the following identities: 13. tan(x) + sec(x) = (cos(x)) / (1-sin(x)) *Sorry for any confusing parenthesis.* My work: I simplified the left side to a. ((sinx) / (cosx)) + (1 / cosx) , then b. (sinx + 1) / cosx = (cos(x)) / (1-sin(x)) I don't know how to verify the rest.

*May 12, 2015 by Taylor*

**trig**

use trig identities to rewrite: (1/(1-cos4v))-(1/(1+cos4v))

*August 26, 2011 by liz*

**Trig**

What is sin^2 - cos^2 x/ 1-2cos^2 x, using the identities.

*May 4, 2008 by Mary*

**trig**

what is the correct answer in trigonometric identities. DiViDE ; x^5 + 5x^4 - 2x^3 + 3x^2 + 2x + 1 by x + 3

*February 2, 2012 by mien*

**trig**

please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1- tan 25° tan 5°

*April 30, 2010 by ann*

**trig**

please help me. use trig. identities to find the exact value. tan 25° + tan 5° / 1- tan 25° tan 5°

*April 30, 2010 by ann*

**math**

how do i solve this using trig identities? 2 csc^2x = 3 cot^2x-1

*October 16, 2007 by Kayla*

**Trig Identities..**

Solve any way possibly? Thank you! 1-sin^2x/1-cosx

*May 15, 2011 by Jill*

**Trig**

Two pilots take off from the same airport. Mason heads due south. Nancy heads 23 west of south. After 400 land miles, how far is Nancy from Mason’s route? I think 156.29, but I'm not sure because the question comes in a lesson on sum and difference identities, and ...

*May 9, 2015 by Anonymous*

**Trig**

verify following trigonometric identities. 1/sec0tan0 = csc0 = sin0

*August 24, 2010 by Jose*

**trig**

How do I prove these trig identities? secx-cosx/tanx =sinx And 1+sinx/cosx+ cox/ 1+sinx=2secx

*May 15, 2011 by Jill*

**pre calculus 2**

use the fundamental trig. Identities to simplify tan^4x+2tan^2x+1

*July 24, 2011 by denise*

**identities trig?**

find all solutions to the equation in the interval [0,2pie] cos2x=cosx

*April 26, 2011 by emily*

**Trig Identities**

Proving identities: 1) 1+ 1/tan^2x = 1/sin^2x 2) 2sin^2 x-1 = sin^2x - cos^2x 3) 1/cosx - cosx = sin x tan x 4) sin x + tan x =tan x (1+cos x) 5) 1/1-sin^2x= 1+tan^2 x How in the world do I prove this...please help... I appreciateyour time thankyou soo much!!

*February 17, 2013 by Deepa*

**trig**

Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help sin (-pi/12)

*June 2, 2008 by Bradley*

**Trig math**

how to split up using sum and difference identities cos (13pi/12) PLeaseeeeeeeeeee help!!! thanx a million

*November 17, 2010 by Sabrina*

**Trig identities:(**

Sin4A - cos4A = sin2A - cos2A Can i just square root the left side??:O

*February 23, 2013 by Kristien*

**trig**

Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help cos (7pi/12)

*June 2, 2008 by Carmen*

**trig**

Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help cos (-5pi/12)

*June 2, 2008 by Carmen*

**trig**

using the trigonometric identities find the exact (radical form) value of cos (105 degrees)

*April 13, 2010 by spencer*

**trig. identities**

sin2x+sin2y=2sin(x+y)cos(x-y) Please helpp mee!! thank you sooo much really!!

*November 9, 2010 by Sabrina*

**trig**

I have to factor the expression and use fundamental identities: sins^2xcscx^2-sin^2x sec^4x-tan^4x

*October 7, 2011 by Help pleaseee*

**trig**

Evaluate giving exact values and identities. Calculator based solutions are not acceptable. Thanks for any help cos (4pi/3 – 3pi/4)

*June 2, 2008 by Carmen*

**Trig**

We started a new lesson on Monday on identities. Our test is tommorrow. I have no idea of what I'm doing! Can somebody help me study?

*January 6, 2010 by Jennifer*

**trig**

find all values of x on interval 0-2pi. (sin4x)(cos7x)=(cos4x)(sin7x) identities should be used.

*January 24, 2011 by Ashten*

**Trigonometry**

Solve. 2sin(2ƒÆ) + ã3 = 0 interval [0, 2ƒÎ) How do I start this? I feel like maybe Trig Identities, but I'm not really sure.

*September 16, 2011 by Josh*

**Trig**

simplify the expression to a single term: (1-2Sin^2 X)^2 + 4sin^2 X Cos^2 X I'm not sure how to start this or which identities to use. Any suggestions?

*May 7, 2012 by Anonymous*

**math-trig**

Use the double angle identities to find sin2x if sinx= 1/square of 17 and cosx<0 . Give exact answer.

*September 24, 2010 by conner*

**Trigonometry**

Simplify the expression using trig identities: 1. (sin4x - cos4x)/(sin2x -cos2x) 2. (sinx(cotx)+cosx)/(2cotx)

*July 15, 2012 by Tasha*

**Trig!**

The identities cos(a-b)=cos(a)cos(b)sin(a)sin(b) and sin(a-b)=sin(a)cos(b)-cos(a)sin(b) are occasionally useful. Justify them. One method is to use rotation matricies. Another method is to use the established identities for cos(a+b) and sin (a+b).

*September 27, 2011 by Elle*

**math**

how would you find the angle to (3)^.5sin(2x)-2cos(2x)+2sin^2(x)=1 I know that you have to use the trig identities but then when i substitue the sin and cos(2x) in i don't know what to do. please help

*May 3, 2009 by mike*

**Math (trigonometry)**

Trigonometry identities are so hard... I need some help proving these identities: *Oh, and I'm only in grade 11, so the identities we use are quotient identity and Pythagorean identity. sinx/(sinx + cosx) = tanx/(1 + tanx) cos^2x - sin^2x = 2cos^2x - 1 Thanks! Lucy

*April 13, 2008 by Lucy*

**trig**

Use trigonometric identities to find sec theta, given that tan theta = Radical 5/ 3.

*August 26, 2011 by Davis*

**trig identities**

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

*May 8, 2013 by Sean*

**Trig**

Eight Fundamental Identities Sec thada - Cos thada How do I do this?

*December 17, 2011 by Don*

**trig**

How to get 5degree without using calculator using identities?

*January 20, 2012 by Laurnece*

**Trig**

Use identities to find indicated values tan (theta)= (12/5), pi <0<3pi/2 Find sin (2theta)

*May 2, 2010 by Stacey grahaM*

**trig**

Use identities to find indicated values tan (theta)= (12/5), pi <0<3pi/2 Find sin (2theta)

*May 2, 2010 by Stacey Graham*

**trig**

Given that tan B= 7/24 with B in quadrant III, find sin 2B, cos 2B, and tan 2B, using angle identities.

*October 11, 2011 by Ryan*

**Trig**

Use trigonometric identities to solve the equation csc^2x -(√3+1)cotx+(√3-1)=0 in the interval [0, 2pi]

*May 9, 2014 by Melissa*

**Trig identities**

Has a negative -5/13 Steve. If angles x and y are in the same quadrant and sin x =3/5 and cos y= -5/13 determine the value of sin (x-y)

*December 8, 2016 by Luke*

**Pre-Calculus**

This question has me stuck. Use the Pythagorean identity sin^2 Θ + cos^2 Θ = 1 to derive the other Pythagorean identities, 1 + tan^2 Θ = sec^2 Θ and 1 + cot^2 Θ = csc^2 Θ. Discuss how to remember these identities and other fundamental identities.

*September 29, 2016 by Iris*

**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

*February 27, 2012 by CHEYANNE*

**trig**

use sum or difference identities to find the exact value of the trigonometric function: tan 345 please show work, i cant figure out what im doing wrong!

*November 19, 2009 by Anonymous*

**Trig identities**

Sin x/[1-cos(-x)] = csc x + cot x Please Verify the Identity. I have been going in circle with this one... Just a hint would be nice. Thank you.

*May 12, 2015 by Ryan*

**Pre-Cal (verifying trig identities)**

How would you verify the identity? sin^1/2x-cosx-sin^5/2xcosx=cos^3xradsinx

*February 12, 2009 by Crystal*

**trig**

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

*May 28, 2012 by marie*

**Trig Identities**

Explain why Sin of theta= -The square root of 1-cos^2 theta is not an identity, using either graphical or numerical reasoning.

*March 25, 2014 by Madison*

**TRIG**

Verify the following identity. 1) sin(x+y) __________ = tanx+tany cosxcosy 2) Write cos3x in terms of cosx I cannot figure out how to solve for identities they are so hard. Any help appreciated!:)

*October 23, 2011 by ALISON*

**Trig**

Column 1 Column 2 (sin theta + cos theta)sq 1 + 2sin theta cos theta Question : how do you get column 1 to be the same as column 2?? using the trig identities

*December 17, 2011 by Don*

**Trig**

Proving Identities: 2 columns (tan + cot)^2 = sec^2 + csc^2 I'm having trouble breaking down the left side to = the right side.. Any help please

*January 8, 2012 by Don*

**trig**

in proving trigonometric identities if cot theta sin theta = cos theta. what is the correct answer?

*February 1, 2012 by mien*

**trig**

what is the correct answer in proving trigonometric identities if tan theta/sin theta = sec theta

*February 2, 2012 by mien*

**trig**

what is the correct answer in proving trigonometric identities if tan theta / sin theta = sec theta

*February 2, 2012 by mien*

**trig**

use basic identities to simplify the expression. csc θ cot θ / sec θ

*July 13, 2013 by tony*

**Trig Identities**

If tan(theta)=7/13 and cos(theta)<0, what is the exact value of sin(theta)?

*August 24, 2009 by Anonymous*

**Trig Identities**

Why does cos^2(x)= 1/2cos(2x)+1/2? I am trying to integrate, but the answer key says to first rewrite the expression like the above. I don't get how to change cos^2(x) into that. Explain?

*February 21, 2016 by Betty*

**Trig**

Half Angle Identities cosx = 7/25 greater than 270 deg and less than 360 Determine cos 1/2x a. -7rt2/10 b. 7rt2/5 c.7/25 d.-4/5 I get 7rt2/5 Is this correct??

*January 2, 2012 by Don*

**Math (Trig) a.s.a.p, thanks!**

verify the identities: 1.) 2tanx-(1+tanx)^2 = -secx 2.) cos(x-330degrees)=1/2(ã3cosx-sinx) *the ãis only over the 3* 3.) 1+cos2x/sinx=cotx any help is greatly appreciated!!

*April 10, 2008 by Hailey*

**Trig**

How do you express these problems as single trigonometric function values or as single numbers, using identities? 1. cos^2pi/8-1/2 2. tan34degrees/2(1-tan^2 34degrees) 3. 1/8sin29.5degreescos29.5degrees

*February 14, 2010 by Kelly*

**Trig**

How do you express these problems as single trigonometric function values or as single numbers, using identities? 1. cos^2pi/8-1/2 2. tan34degrees/2(1-tan^2 34degrees) 3. 1/8sin29.5degreescos29.5degrees

*February 14, 2010 by Jessica*

**Trigonometric Identities**

Which of the following are trigonometric identities, I have narrowed it down to two - (cscx + cotx)^2 = 1 OR sin^2(x)sec^2(x) + 1 = cot^2(x)csc^2(x)

*March 24, 2011 by Veronica*

**math trig identities**

a)cos4x-sin4xcot2x=-1 b)1+sinx+cosx/1+sinx-cosx=cot(x/2) i tried to ask my teacher but she doesnt know please help me!

*January 20, 2011 by Sabrina*

**trig**

in proving trigonometric identities if sec theta - tan theta sin theta is equal to cos theta. what is the correct answer?

*February 1, 2012 by mien*

**trig identities**

cos94 degrees cos18 degrees+ sin94 degrees sin18 degrees. write the expression as the sine, cosine, or tangent of an angle.

*April 26, 2011 by caitlyn*

**trig**

How do you solve for these identities: 1-sin^2è/cosè= cosè sin^4è-cos^4è=2sin^2è-1

*May 3, 2010 by Anonymous*

**Trig**

If sinx = 1/4 Find the exact value of cos2x I used the formula for double angle identities : cos2x = 1-2sin^2x and got the answer 1/2 The book says the answer is 7/8 How would they get to that conclusion?

*December 27, 2011 by Don*

**calculus**

need help simplifying some trig identities such as: (csc t) (sin t) cos t = 0.75 and tan t = 0.88, find sec t and cot t; (cot2t) (sin2t) + sin2 t; csc2t - cot2t/sin2t

*March 25, 2012 by angelia*

**trig**

in proving trigonometric identities if 1 + sin^2 theta is equal to 2 sin^2 theta + cos^2 theta. what is the correct answer?

*February 1, 2012 by mien*

**trig**

Use standard identities to express sin(2θ+π/3) in terms of sinθ and cosθ

*April 10, 2014 by Pam*

**trig**

what is the correct answer in proving trigonometric identities if tan theta cos^2 theta + cos^2 theta

*February 2, 2012 by mien*

**Trig/Precalc**

Find the greatest possible value of 5cos(x)+6sin(x). I know that it would be a good idea to look for identities that are in the form of acos(x)+bsin(x), but I can't seem to find any. Other than that I don't really know where to go with this problem. Any help would be much ...

*December 16, 2014 by majorbill*

**trig**

Use the fundamental identities to simplify the expression. cos^2θ/sin^2θ+cscθsinθ I got tan^2theta

*June 21, 2013 by tony*

**Trig**

How would you find tan80 and tan55 as needed in this problem? Use identities to find each exact value. (tan80+tan55)/(1-tan80tan55)

*February 2, 2010 by Chloe*

**Math**

Prove Trig. Identities 1. sec è (sec è - cos è)= tan^2 è 2. tan^2 è (1 + cot^2 è) = sec^2 è

*March 23, 2010 by Priscilla*

**Trig**

Use reduction identities to determine if the following statement is true or false: tan (A-B) = tan (B-A) Is this starement True or False ?

*December 22, 2011 by Don*

**Trig**

Simplify each expression using fundamental identities. 1. Sin theta cot theta 2. 1-sin^2 theta / cos theta

*May 7, 2014 by Anonymous*

**trig**

Work out the following identities a)sin pheta / cos pheta b)tan pheta cos pheta

*April 8, 2008 by Walter*

**trig**

Work out the following identities a) sin theta/cos theta b) tan theta cos theta

*April 16, 2008 by Abigail*

**trig**

We are doing trig identities in school. I need help with these five: 1.1+sinx/1-sinx=cscx+1/cscx-1 2.tanx+sinx/1+cosx=tanx 3.sec^2x/sin^2x=1/sin^2x+1/cos^2x 4.tan^2x/1+tan^2x=1-cos^2x 5.sinx-sin^3x/cos^3x=tanx

*December 4, 2011 by Jay*

**Trigonometry**

How am I suppose to transform the left side of the equation into the right side using trig identities? ): 1) sin^2θ - cos^2θ = 2 sin^2θ - 1

*January 10, 2013 by Sira*

**TRIG**

Can someone please help me? Use identities to find the indicated value for each angle measure. sin θ = 12/13, cos θ > 0 Find cos (2θ).

*May 2, 2010 by Debbie*

**Trig**

Verify each trigonimetric equation by substituting identities to match right hand side of the equation to the hand side of the equation. Please help. -tan^2x+sec^2x=1

*December 8, 2014 by Nancy Jones*

**Math-Trigonometry**

Show that if A, B, and C are the angles of an acute triangle, then tan A + tan B + tan C = tan A tan B tan C. I tried drawing perpendiculars and stuff but it doesn't seem to work? For me, the trig identities don't seem to plug in as well. Help is appreciated, thanks.

*November 6, 2013 by Sam*

**Math**

Select all the true statements about identities. A) You may use proven identities to prove other identities. B) An identity is true only for restricted values of the variables. C) You can prove an identity by graphing the side to the left of the equal sign, graphing the side ...

*October 14, 2014 by TeeKay*