My table of Integrals has the overall circumstance ##int frac dx x^two+a^two ## as being a 'normal' integral far too, not merely the case exactly where ##a=1##. But I believe this staying a Calculus research trouble it is predicted from the OP to figure out how to do it. Hints https://gabletoppak.com/is-it-legal-to-sell-natural-mineral-water-in-gabletop-cartons-tetra-paks-and-aluminium-cans-in-india/