Tuesday

September 16, 2014

September 16, 2014

Number of results: 3,451

**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*

**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**

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**

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(2) + 3 = 0 interval [0, 2) 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/ 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*

**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**

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(3cosx-sinx) *the is 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^2/cos= cos sin^4-cos^4=2sin^2-1
*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**

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 (sec - cos )= tan^2 2. tan^2 (1 + cot^2 ) = sec^2
*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*

**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*

**trig**

A coil of wire rotating in a magnetic field induces a coltage E=20sin((PIa/4) - (PI/2)). Use an identity to express this in terms of cos(PIa/4). Types of Identities: Double Angle, Half Angle, Sum and Difference of Sine, Cosine, and Tangent, Pythagorean, Reciprocal, Quotient. ...
*April 27, 2011 by Blake*

**trig**

Why do you have to leave one side alone when proving a sentence to be true? This question relates to identifying trigonometric identities to be true, however, my teacher says this question applies to everything. I do not understand this question, let alone, the answer. Can ...
*January 18, 2010 by John*

**TRIG..............**

Q.1 Prove the following identities:- (i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx (ii) (1+cotx+tanx)(sinx-cosx)/sec^3x-cosec^3x = sin^2xcos^2x.
*June 10, 2011 by MATHS*

**Trig**

Column 1 Column 2 sec theta - cos theta tan theta sin theta Question: how do you get column 1 to be the same as column 2 ?? using the eight fundamental identities
*December 17, 2011 by Don*

**Trigonometry**

This is more of an opinion question: I'm working on Verifying Identities but I always have trouble knowing where to start. Once my teacher points it out i'm like "oh, duh" but on my own I have not the slightest idea on how to begin these; especially the tricky ones. Does ...
*March 25, 2008 by Izza*

**Precalculus/Trig**

I can't seem to prove these trig identities and would really appreciate help: 1. cosx + 1/sin^3x = cscx/1 - cosx I changed the 1: cosx/sin^3x + sin^3x/sin^3x = cscx/1-cosx Simplified: cosx + sin^3x/sin^3x = cscx/1-cosx I don't know where to go from there. 2. (sinx + cosx)(tanx...
*August 15, 2014 by Heather*

**Trigonometry - Proofs**

Prove that the average of the numbers n sin (n degrees) (n = 2, 4, 6, ... 180) is cot (1 degree) Hint: Express everything in terms of sin and cos. Can you rearrange the result into a form that allows you to use some of the identities you've learned? How to start? I know I have...
*November 12, 2013 by Sam*

**Trig**

Use the fundamental identities to simplify the expression: cot beta sec beta I used 1+tan^2u=secu since cot is the inverse of tan. I flipped the tangent, then so it was 1+ (1/tan). But the book's answer is the cosecant of beta. Where did this come from??
*January 4, 2010 by Tara*

**Precalculus**

Verify the identities. Cos^2x - sin^2x = 2cos^2x - 1 When verifying identities, can I work on both side? Ex. 1 - sin^2x - sin^2x = 1 - 2sin^2x 1 - 2sin^2x = 1 - 2sin^2x
*April 3, 2013 by Shadow*

**math trig**

verify the identities COSX OVER 1PLUS SINX PLUS 1PLUS SINX OVER COSX IS EQUAL TO 2SEC.
*March 19, 2014 by mier*

**Trig**

Half angle identities Find exact values of a) cos 1/2 b) sin 1/2 c) tan 1/2 based on: cos = 1/5 greater than 270 deg less than 360 deg. I get a) - rt 3/5 b) rt24/5 and c) does not work out at all .... Help please.. book says for answers a)-rt15/5 b) rt10/5 c) -rt6/3 How do you...
*January 1, 2012 by Don*

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