could anyone give me a hint to calculate this integral?(adsbygoogle = window.adsbygoogle || []).push({});

integral _{-inf, +inf} { exp(-x^2) / (x^2 + a^2) } _ dx

(I`m ignorant of tex)

the answer given from the mathematica is e^(a^2)/a * Pi * Erfc[a]

but there is no process of detailed calculation..

plz give me a hand..

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# Error function integral

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