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为什么-(√3/3)sin^2 a=-(√3/6)(1-cos 2a)
人气:480 ℃ 时间:2019-09-30 06:20:18
解答
解此时用了sin^2a=1/2(1-cos2a)的公式
即-(√3/3)sin^2 a
=-(√3/3)×1/2(1-cos2a)
=-(√3/6)(1-cos2a)
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