cos^2 x - sin^2 x 是怎么化简=cos 2x cos^2 x - sin^2 x 是怎么化简=cos 2x的?
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cos^2x-sin^2x是怎么化简=cos2xcos^2x-sin^2x是怎么化简=cos2x的?cos^2x-sin^2x是怎么化简=cos2xcos^2x-sin^2x是怎么化简=cos2x的?
cos^2 x - sin^2 x 是怎么化简=cos 2x cos^2 x - sin^2 x 是怎么化简=cos 2x的?
cos^2 x - sin^2 x 是怎么化简=cos 2x
cos^2 x - sin^2 x 是怎么化简=cos 2x的?
cos^2 x - sin^2 x 是怎么化简=cos 2x cos^2 x - sin^2 x 是怎么化简=cos 2x的?
cos²x-sin²x
=cosxcosx-sinxsinx
=cos(x+x)
=cos2x
sin^3 x -cos^3 x sin^3 x -cos^3 x =(sin x -cos x )(sin^2 x +sin x*cos x +cos^2 x )问下这个是个公式还是什么?怎么样算出来的?
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