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sin,cos,tan,cot,sec,csc是什么意思？ - 知乎 sin （sine）正弦 cos ( co-sine ) 余弦 tan （tangent） 正切 cot （co-tangent）余切 sec （secant） 正割 csc （co-secant）余割 co-前缀有伙伴的意思，比如coworker意为同事，所以上面的可分为三类。正、余分别对应直角三角形除直角外的另外两个角。 反映的是直角三角形，在某一夹角时，各边的比例关系。可通过
C:\Windows\CSC?? - Tech Support Forum CSC was storing about 17GB of cache data from 3 years ago Note that if Enable Offline Files is unticked, you must enable it before you can reach the Delete Files button Also, as noted elsewhere, View Files won't necessarily show you any files, however Ctrl+Shift+Delete Files should clear all but the last 2MB or so of C:\WINDOWS\CSC