Question Number 30525 by abdo imad last updated on 22/Feb/18
$${let}\:{I}\:=\:\int_{\mathrm{0}} ^{\infty} \:\:\frac{{e}^{−{x}} }{\mathrm{1}+{x}^{\mathrm{2}} }\:{give}\:{I}\:{at}\:{form}\:{of}\:{series}\:. \\ $$
let-I-0-e-x-1-x-2-give-I-at-form-of-series-