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Prove cos^4 A-cos^2 A=sin^4 A-sin^2 A
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Prove
cos^4 A-cos^2 A=sin^4 A-sin^2 A
cos^4 A-cos^2 A=sin^4 A-sin^2 A
Prove cos^4 A-cos^2 A=sin^4 A-sin^2 A
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