My table of Integrals has the final situation ##int frac dx x^two+a^2 ## as a 'typical' integral much too, not only the case the place ##a=1##. But I do think this currently being a Calculus research dilemma it is expected of your OP to figure out how to do it. https://gabletoppak.com/single-use-plastic-water-bottles-will-not-be-available-in-himachal-from-june-1-use-glass-bottles-and-dispensers-instead/