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cos(π/2-5π/4)等于多少
人气:369 ℃ 时间:2020-05-14 23:07:06
解答
cos(π/2-5π/4)
=cos(2π/4-5π/4)
=cos(-(3π/4)因为是偶函数,所以
=cos3π/4
=√2/2
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