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Prove sin^4 A+cos^4 A=1-2sin^2 Acos^2 A
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Prove
sin^4 A+cos^4 A=1-2sin^2 Acos^2 A
sin^4 A+cos^4 A=1-2sin^2 Acos^2 A
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(1-cos^4A)/sin^4A =1+2cot^2A
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`cos^4A-sin^4A` is equal to
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`(sin(4. 1-2beta)+sin(4B-2A)/(cos(4A-2B)+cos(4B-2A)=tan(A+B)`
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