Quay lại đáp án

	2	bớt 1 ký tự trong đáp án	Cải thiện 08-04-16 05:59 PM trangjn10 1	Sửa 08-04-16 05:56 PM trangjn10 1
$4.cos(\frac{3x}{2}).cosx.sin\frac{x}{2}=4.\frac{1}{2}(sin2x-sinx).cosx=2sin2x.cosx-sin2x=sinx+sin3x-sin2x$ $4.cos(\frac{3x}{2}).cosx.sin\frac{x}{2}=4.\frac{1}{2}(sin2x-sinx).cosx=2sin2x.cosx-2sin2x=sinx+sin3x-sin2x$ $4.cos(\frac{3x}{2}).cosx.sin\frac{x}{2}=4.\frac{1}{2}(sin2x-sinx).cosx=2sin2x.cosx-sin2x=sinx+sin3x-sin2x$

	1	tạo mới
$4.cos(\frac{3x}{2}).cosx.sin\frac{x}{2}=4.\frac{1}{2}(sin2x-sinx).cosx=2sin2x.cosx-2sin2x=sinx+sin3x-sin2x$

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