1/2+2cos2x-二分之根号三sin2x-3cos2x/2
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1/2+2cos2x-二分之根号三sin2x-3cos2x/2
1/2+2cos2x-二分之根号三sin2x-3cos2x/2
1/2+2cos2x-二分之根号三sin2x-3cos2x/2
(1/2)+2cos2x-(√3/2)sin2x-(3/2)cos2x
=(1/2)+(1/2)cos2x-(√3/2)sin2x
=(1/2)+cos60°cos2x-sin60°sin2x
=(1/2)+cos(60°+2x)