y=arctanx/(1+x2),则y’=________.

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问题 y=arctanx/(1+x2),则y’=________.

选项

答案(1-2xarctanx)/(1+x2)2

解析 [1/(1+x2)·(1+x2)-2xarctanx]/(1+x2)2=(1-2xarctanx)/(1+x2)2
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