can you prove that: 1/(cos^2 x-sin^2 x)^2 - 4tan^2 x/ (1-tan^2 x)^2 =1 im kinda stuck right now.
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Originally Posted by lezah can you prove that: 1/(cos^2 x-sin^2 x)^2 - 4tan^2 x/ (1-tan^2 x)^2 =1 im kinda stuck right now. now expand as
Last edited by harish21; Apr 20th 2010 at 09:26 PM.
Originally Posted by lezah can you prove that: 1/(cos^2 x-sin^2 x)^2 - 4tan^2 x/ (1-tan^2 x)^2 =1 im kinda stuck right now. cos^2(x) - sin^2(x) = cos(2x) 2tax(x)/(1-tan^(x)] = tan(2x) So the given problem is 1/cos^2(2x) - tan^2(2x) sec^2(2x) - tan^2(2x) = .......?
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