cos2x等于多少

QQ号下载2022-11-07  14

cos2x等于多少?导读:cos2x等于多少?cos2x的平方等于多少?写出具体推导过程cos2x等于多少? cos2x = cosx-sinx = 2 cosx-1 = 1-2 sinx =(1-tanx)\/(1+tanx)
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