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sin2x=2sinx*cosx,這個公式學過沒 原方程可化為2sinx*cosx-2sinX+cosX-1=0 因式分解得(2sinx+1)(cosx-1)=0 所以sinx=-1/2或cosx=1 所以x=2k派-派/6(k為整數)或x=2k派-5派/6(k為整數)或x=2k派(k為整數)
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