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从小到大排列 sin4/5派 -cos5/4派 sin32/5派 cos5/12派
人气:402 ℃ 时间:2020-07-11 21:13:51
解答
-cos(5π/4)=cos(π/4)
sin(32π/5)=sin(2π/5)
sin(4π/5)=sin(π/5)
cos(5π/12)=sin(π/12)
sin(π/12)所以cos(5π/12)
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