cos(π/6+3x)=sin(π/2-(π/6+3x))=sin(π/3-3x)
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cos(π/6+3x)=sin(π/2-(π/6+3x))=sin(π/3-3x)
cos(π/6+3x)=sin(π/2-(π/6+3x))=sin(π/3-3x)
cos(π/6+3x)=sin(π/2-(π/6+3x))=sin(π/3-3x)
cosα=sin(π/2-α)这是诱导公式,是cos(π/6+3x)=sin(π/2-(π/6+3x))的原因.
然后再去括号就可以了,(π/2-(π/6+3x))=π/3-3x.
没什么难理解的.
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