Question Number 75734 by mathmax by abdo last updated on 16/Dec/19
$${calculate}\:{f}\left({x}\right)=\int_{\mathrm{0}} ^{\frac{\pi}{\mathrm{4}}} {ln}\left(\mathrm{1}+{xtan}\theta\right){d}\theta\:\:{with}\:{x}\:>\mathrm{0} \\ $$
calculate-f-x-0-pi-4-ln-1-xtan-d-with-x-gt-0-