计算∫0+∞arctanx/x2dx.

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问题 计算∫0+∞arctanx/x2dx.

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答案1+∞arctanx/x2dx=-∫1+∞arctanxd(1/x)=-arctanx/x|1+∞+∫1+∞1/x(1+x2)dx=π/4+1/2∫1+∞(1/x2-1/(1+x2))d(x2)=π/4+1/2lnx2/(1+x2)|1+∞=π/4+1/2ln2.

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