My table of Integrals has the final circumstance ##int frac dx x^two+a^two ## to be a 'regular' integral too, not only the case the place ##a=one##. But I do think this becoming a Calculus homework challenge it is predicted of the OP to figure out how to do it. Hints https://gabletoppak.com/kerala-get-ready-to-say-no-to-plastic-from-october-2/