sin(x-y)cosy+cos(x-y)siny=(  )A.sinx B.

练习题库2022-08-02  16

问题 sin(x-y)cosy+cos(x-y)siny=(  )A.sinxB.sinxcosyC.cosxD.sinycosx

选项 A.sinx
B.sinxcosy
C.cosx
D.sinycosx

答案 A

解析 原式=sin[(x-y)+y]=sinx.
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