设f(x)=arctanx,则<img src='https://img2.soutiyun.com/latex/latex.action' />( )。

A.1 B.-1 C.<img src='https://img2.soutiyun.com/latex/latex.action' />D.<img src='https://img2.soutiyun.com/latex/latex.action' />

时间:2023-03-29 10:14:48

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