Tan(x)与Sin(x) .Cos(x)什么关系?
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Tan(x)与Sin(x) .Cos(x)什么关系?
Tan(x)与Sin(x) .Cos(x)什么关系?
Tan(x)与Sin(x) .Cos(x)什么关系?
Tan(x)=Sin(x)/Cos(x)
证明:我不会画图,你自己画一个直角三角形ABC,角B为直角,
sinA =BC/AC,cosA =AB/AC,
tanA =BC/AB =(BC/AC)/(AB/AC) =sinA/cosA
所以,tanA=sinA/cosA
即,Tan(x)=Sin(x)/Cos(x)
Tan(x)=Sin(x)Cos(x)
想知道更多:http://zhidao.baidu.com/question/45877900.html
天哪!这位仁兄几年级啊?tanx=sinx/cosx不知道?
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