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cos(-19π/4)的值
人气:236 ℃ 时间:2020-08-30 21:51:45
解答
cos(-19π/4)
=cos(19π/4)
=cos[4π+3π/4]
=cos(3π/4)
=cos[π-π/4]
=-cos(π/4)
=-√2/2
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