∫x2/(1+x2)arctanxdx.

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问题 ∫x2/(1+x2)arctanxdx.

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答案∫x2/(1+x2)arctanxdx=∫(1-1/(1+x2))arctanxdx=∫arctanxdx-∫arctanxd(arctanx)=xarctanx-∫x/(1+x2)dx-1/2arctan2x=xarctanx-1/2ln(1+x2)-1/2arctan2x+C.

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