Question Number 42629 by prof Abdo imad last updated on 29/Aug/18
$${find}\:{A}_{{n}} =\int_{\mathrm{0}} ^{\infty} \:\:\frac{{sin}\left({nx}\right)}{{sh}\left(\mathrm{2}{nx}\right)}{dx}\:\:{with}\:{n}\:{natural}\:{integr} \\ $$$${not}\:\mathrm{0}. \\ $$