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化简cos²(α-π/4)-sin²(π/4-α)~
人气:125 ℃ 时间:2020-02-06 12:14:44
解答
答:
cos²(a-π/4)-sin²(π/4-a)
=cos²(a-π/4)-sin²(a-π/4)
=cos(2a-π/2)
=cos(π/2-2a)
=sin2a
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