sin^4x cos^2x+cos^4x sin^2 x=sin^2x*cot^2x 怎么得来sin^4x cos^2x+cos^4x sin^2 x=sin^2x*cot^2x 怎么得来

问题描述:

sin^4x cos^2x+cos^4x sin^2 x=sin^2x*cot^2x 怎么得来
sin^4x cos^2x+cos^4x sin^2 x=sin^2x*cot^2x 怎么得来

应该=sin²xcos²x吧!
sin^4x cos^2x+cos^4x sin^2 x
原式=sin²x*sin²xcos²x+cos²x*sin²xcos²x
=sin²xcos²x(sin²x+cos²x)
=sin²xcos²x
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这个不是等于1吗

原式等于 sin^2(sin^2+cos^2)+cos^2 = sin^2*(1)+cos^2 = sin^2+cos^2 = 1