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
化简:sin(x-2派)cos(x+派)tan(x-99派)/cos(派-x)sin(3派-x)sin(-x-派)
sin(x+派/3)+2sin(x-派/3)-根号3cos(2派/3-x)
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证明sin派(x-1)=-sin派x