f(x)=√3sin2x－2sin²x① =√3sin2x＋cos2x－1② =2sin(2x＋π/6)－1③
从①到②是怎么来的?
人气：312 ℃ 时间：2020-04-09 01:19:49
解答
sinX的平方=(1-cos2X)/2,是一个推导公式
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