1/2cos方x-sinxcosx-1/2sin方x
求最小正周期
人气：214 ℃ 时间：2020-02-05 21:14:55
解答
=1/4cos2x+1/4-1/2sin2x+1/4cos2x-1/4
=1/2cos2x+1/2sin2x
=根号下1/2 sin(2x+pi/4)
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