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September 18, 2014

September 18, 2014

Posted by **GIGI** on Wednesday, February 29, 2012 at 8:55pm.

cos2x+tan2xcos2x=1

sin4x-cos4x/sin2x=1-cot2x

- MATH -
**Steve**, Thursday, March 1, 2012 at 10:27amDoes cos2x mean cosine squared? cos^2(x)

If so, then you have

cos^2(x) + sin^2(x)/cos^2(x) * cos^2(x)

= cos^2(x) + sin^2(x)

= 1

If you mean cos(2x) then the equation is not an identity (e.g.: x = pi/2)

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