-(2cos^2x-1-2sin^2x)cos^2x 这个怎么变成 -cos^2x+4sin^2xcos^2x
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-(2cos^2x-1-2sin^2x)cos^2x 这个怎么变成 -cos^2x+4sin^2xcos^2x
-(2cos^2x-1-2sin^2x)cos^2x
=-(1-2sin^2x-2sin^2x)cos^2x
=-cos^2x+4sin^2xcos^2x
=-(1-2sin^2x-2sin^2x)cos^2x
=-cos^2x+4sin^2xcos^2x
sin^2x+cos^2x)(sin^4x-sin^2xcos^2x+cos^4x) =sin^4x-sin^2xcos
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化简cos^4x+sin^2xcos^2x+sin^2x
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