赞 honglongjun 幼苗
共回答了18个问题采纳率：88.9% 举报
1/2 cosx-根号3/2 sinx
= sinπ/6 cosx-cosπ/6 sinx
= sin(π/6-x)
= -sin(x-π/6)
= sinπ/6 cosx-cosπ/6 sinx
= sin(π/6-x)
= -sin(x-π/6)
1年前
7
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