find-0-sin-3cosx-x-2-4-2-dx-

Question Number 118949 by Bird last updated on 21/Oct/20

$${find}\:\int_{\mathrm{0}} ^{\infty} \:\frac{{sin}\left(\mathrm{3}{cosx}\right)}{\left({x}^{\mathrm{2}} +\mathrm{4}\right)^{\mathrm{2}} }{dx} \\ $$