Question Number 103080 by abdomsup last updated on 12/Jul/20
$${calculate}\:{A}_{{n}} =\int_{\mathrm{0}} ^{\infty} \:\frac{{cos}\left({nx}\right)}{\left(\mathrm{1}+{x}^{\mathrm{2}} \right)^{{n}} }{dx} \\ $$$${with}\:{n}\:{integr}\:{natural} \\ $$
calculate-A-n-0-cos-nx-1-x-2-n-dx-with-n-integr-natural-