cos30°=根号3 /2=0.86602540378444
cos60°=1/2
cos45°=根号2 /2=0.70710678118655
cos30°约等于多少?cos60°呢?cos45°呢?
cos30°约等于多少?cos60°呢?cos45°呢?
数学人气:634 ℃时间:2020-02-05 07:15:29
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