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化简: sinx cosx cos2x =? 需要详细过程,谢谢
人气:261 ℃ 时间:2020-02-03 00:20:13
解答
sinx cosx cos2x
=0.5(2sinxcosx)cos2x
=0.5(sin2xcos2x)
=0.5×0.5sin4x
=(1/4)×sin4x
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