化简:sin(x+60°)+2sin(x-60°)-√3cos(120°-x)=
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化简:sin(x+60°)+2sin(x-60°)-√3cos(120°-x)=
![化简:sin(x+60°)+2sin(x-60°)-√3cos(120°-x)=](/uploads/image/z/15424970-50-0.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9Asin%EF%BC%88x%2B60%C2%B0%EF%BC%89%2B2sin%EF%BC%88x-60%C2%B0%EF%BC%89-%E2%88%9A3cos%EF%BC%88120%C2%B0-x%EF%BC%89%3D)
Sin(x+60)+2sin(x-60)-√3cos(120-x)
=(sinxcos60+cosxsin60)+2(sinxcos60-cosxsin60)-√3(cos120cosx+sin120sinx)
=1/2sinx+√3/2cosx+sinx-√3cosx+√3/2cosx-3/2sinx
=0
=(sinxcos60+cosxsin60)+2(sinxcos60-cosxsin60)-√3(cos120cosx+sin120sinx)
=1/2sinx+√3/2cosx+sinx-√3cosx+√3/2cosx-3/2sinx
=0
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