y=sin^4x+cos^4x=(sin^2x+cos^2x)^2-2sin^2xcos^2x 这一步是怎么来的?
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y=sin^4x+cos^4x=(sin^2x+cos^2x)^2-2sin^2xcos^2x 这一步是怎么来的?
y=sin^4x+cos^4x=(sin^2x+cos^2x)^2-2sin^2xcos^2x 这一步是怎么来的?
y=sin^4x+cos^4x=(sin^2x+cos^2x)^2-2sin^2xcos^2x 这一步是怎么来的?
y=sin^4x+cos^4x
=sin^4x+cos^4x+2sin^2xcos^2x-2sin^2xcos^2x
=(sin^2x+cos^2x)^2-2sin^2xcos^2x
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