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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。 …

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我手边cos的衣服不多，夏天买了一大堆衣服，可惜尺码没选对，后来全退了单留了件长裤跟衬衣。 最近买了一件马甲，喜欢的不得了。 我个人还是很喜欢这个牌子的，衣服种类多，雷款 …

Similarly, if I enter =cos(30), the number returned is .154251. I had expected .5000 in the first case and .8660 in the second. If you read the help page for SIN and COS, you will see that …

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