prove that cos^4 A - cos^2 A = sin^4 A - sin^2 A
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cos^4 A - cos ^2 A = cos^2 A ( cos^2 A - 1)
= (1-sin^2 A)(- sin^2 A) = sin ^4 A - sin ^2 A............. Proved
= (1-sin^2 A)(- sin^2 A) = sin ^4 A - sin ^2 A............. Proved
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