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trigpower reducing formulas
Having trouble with this problem: Rewrite the expression as an equivalent expression that does not contain powers greater than 1. Cos³x My answer: cos³x=(cos²x)(cosx) =(1+cos2x/2)(cosx)>cos+cos³x/2...which is wrong
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Verify Identity: cos5xcos3x=8sin^2x(2cos^3xcosx)
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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!:)
asked by ALISON on October 23, 2011 
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By expressing 3x as (2x + x) prove that cos3x = 4cos^3x  3cosx
asked by Rin on December 13, 2011 
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By expressing 3x as (2x + x) prove that cos3x = 4cos^3x  3cosx
asked by Rin on December 13, 2011

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Prove the identity cos3x ≡ 4cos^3x  3cosx Thank you so much for the help!
asked by Autumn on December 6, 2018 
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Verify the identity . (cscXcotX)^2=1cosX/1+cosX _______ sorry i cant help you (cscXcotX)=1/sinX  cosX/sinX = (1cosX)/sinX If you square this you have (1cosX)^2/(sinX)^2 Now use (sinX)^2 = 1  (cosX)^2 to get (1cosX)^2 / 1 
asked by Rose on October 9, 2006 
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Prove the following functions: (sinx+sin2x)/(1+cosx+cos2x)=tan x (cos3x/sinx)+(sin3x/cosx)=2cot2x tan2x=(2/cotxtanx) theses are due in the am. Fastness would be great?
asked by jared on November 7, 2011 
Calculus 2 Trigonometric Substitution
I'm working this problem: ∫ [1tan^2 (x)] / [sec^2 (x)] dx ∫(1/secx)[(sin^2x/cos^2x)/(1/cosx) ∫cosxsinx(sinx/cosx) ∫cosx∫sin^2(x)/cosx sinx∫(1cos^2(x))/cosx sinx∫(1/cosx)cosx sinx∫secx∫cosx
asked by Janice on March 15, 2015 
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If f(x)=4sinx/1+cosx then f'(x)=_____? I think that the derivative of 4sinx would be 4cos and cosx would be sinx but I don't know where to go from there.
asked by gnozahs on June 5, 2009