My desk of Integrals has the general situation ##int frac dx x^two+a^2 ## being a 'normal' integral far too, not simply the case exactly where ##a=1##. But I believe this currently being a Calculus research trouble it is predicted from the OP to figure out how to get it done. https://gabletoppak.com/kerala-high-court-says-not-to-use-plastic-bottles-at-weddings-in-state/