My table of Integrals has the final scenario ##int frac dx x^two+a^2 ## as a 'typical' integral way too, not only the case in which ##a=one##. But I do think this getting a Calculus homework difficulty it is expected of the OP to figure out how to do it. Hints https://gabletoppak.com/free-water-advertising-a-sustainable-and-emotional-path-to-powerful-brand-recognition/