My table of Integrals has the general case ##int frac dx x^two+a^two ## being a 'common' integral way too, not only the case exactly where ##a=one##. But I do think this being a Calculus research issue it is expected on the OP to figure out how to get it done. https://gabletoppak.com/elevate-your-brand-with-gable-top-paks-white-label-water-packaging/