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sin(2x-y)cosy+cos(2x-y)siny=?
题目详情
sin (2x-y)cosy+cos(2x-y)siny=?
▼优质解答
答案和解析
sin (2x-y)cosy+cos(2x-y)siny
=sin[(2x-y)+y]
=sin2x
=sin[(2x-y)+y]
=sin2x
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