Friday
December 2, 2016

# Search: Trig identities:(

Number of results: 3,973

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
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)

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
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

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.

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
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

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

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