sin(x+派/3)+2sin(x-派/3)-根号3cos(2派/3-x)

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sin(x+派/3)+2sin(x-派/3)-根号3cos(2派/3-x)sin(x+派/3)+2sin(x-派/3)-根号3cos(2派/3-x)sin(x+派/3)+2sin(x-派/3)-根号3

sin(x+派/3)+2sin(x-派/3)-根号3cos(2派/3-x)
sin(x+派/3)+2sin(x-派/3)-根号3cos(2派/3-x)

sin(x+派/3)+2sin(x-派/3)-根号3cos(2派/3-x)
原式=1/2sinx+根号3/2cosx+sinx-根号3cosx+根号3/2cosx-3/2sinx (先全部展开)
=0(最后合并同类项得0)

3sinX