三角函数的导数关于余割csc的导数
证明导数(cscx)= -cscxcotx
有一点不太明白 1/sin x)'=-1/(sin^2 x) * (sin x)' 是怎么得到的~
人气:123 ℃ 时间:2019-08-26 07:20:35
解答
(cscx)'=(1/sin x)'=-1/(sin^2 x) * (sin x)'
=-1/(sin^2 x) * (cos x)=-(1/sin x) * (cos x/sin x)= -cscxcotx
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