My table of Integrals has the general situation ##int frac dx x^two+a^two ## being a 'normal' integral too, not just the case exactly where ##a=one##. But I do think this currently being a Calculus research difficulty it is anticipated of your OP to determine how to get it done. Hints https://gabletoppak.com/free-water-advertising-a-sustainable-and-emotional-path-to-powerful-brand-recognition/