Question Number 119317 by Bird last updated on 23/Oct/20
$${calculate}\:\int_{\mathrm{0}} ^{\mathrm{2}\pi} \:\frac{{d}\theta}{\left({x}^{\mathrm{2}} −\mathrm{2}{cos}\theta\:{x}+\mathrm{1}\right)^{\mathrm{2}} } \\ $$
calculate-0-2pi-d-x-2-2cos-x-1-2-