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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。正、余分别对应直角三角形除直角外的另外两个角。
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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，雷款少，做工精致。
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Hi, DDuchesne You can try the following suggestions: 1 Reset Windows Update components: This includes stopping the Windows Update service, clearing the Windows Update cache, and then restarting the service
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