字典翻译 问答 小学 数学 为啥sin(-x+m-π/3)=sin(x+m-π/3)-x+m-π/3=2kπ+x+m-π/3,-x+m-π/3=2kπ+π-(x+m-π/3)
问题标题:
为啥sin(-x+m-π/3)=sin(x+m-π/3)-x+m-π/3=2kπ+x+m-π/3,-x+m-π/3=2kπ+π-(x+m-π/3)
问题描述:

为啥sin(-x+m-π/3)=sin(x+m-π/3)-x+m-π/3=2kπ+x+m-π/3,-x+m-π/3=2kπ+π-(x+m-π/3)

商建云回答:
  诱导公式   sin(a+2kπ)=sina   sin(2kπ+π-a)=sina
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