2^5 sin^4a cos^2a = cos6a - 2cos4 a - cos2a + 2
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Prove that : cos^4A - cos^2A = sin^4A - sin^2A
cos^4 A - cos^2A = sin^4A - sin^2A LHS. = cos^2A(1 - cos^2A) = cos^2A sin^2A [ sin^2A + cos^2A = 1] RHS = sin^2A (1 - sin^2A) = sin^2Acos^2A [ sin^2A + ...
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