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cos^2-π/8-1/2=?
人气:184 ℃ 时间:2020-05-13 04:41:52
解答
cos^2-π/8-1/2
=cos^2(π/8)-1/2
=[1+cos2(π/8)]/2-1/2
=[1+cos(π/4)]/2-1/2
=1/2+√2/4-1/2
=(√2)/4
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