cos^4A-cos^2A=sin^4A-sin^2A
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Answered by
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Step-by-step explanation:
cos ^4A - cos^2A = sin^4A-sin^2A
LHS =
(cos^2A)^2 - cos^2A
= (1 - sin^2A)^2 - (1- sin^2A)
= 1 - 2sin^2A + sin^4A - 1 + sin^2A
= 0 - sin^2A + sin^4A
= sin^4A - sin^2A
so LHS = RHS
hence proved..
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Answered by
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