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数学
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cosπ/8和sinπ/8怎么算啊
额 不好意思了都...
人气:274 ℃ 时间:2019-12-14 01:42:28
解答
(cosπ/8)^2=(1+cosπ/4)/2=(2+根号2)/4
开方即得cosπ/8
同理(sinπ/8)^2=(1-cosπ/4)/2=(2-根号2)/4
开方即得sinπ/8
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