My desk of Integrals has the final case ##int frac dx x^two+a^2 ## as being a 'regular' integral far too, not only the case the place ##a=one##. But I do think this currently being a Calculus homework problem it is predicted from the OP to figure out how to do https://gabletoppak.com/kerala-high-court-says-not-to-use-plastic-bottles-at-weddings-in-state/