My Table of Integrals has the general case ##int frac dx x^two+a^two ## like a 'normal' integral also, not just the situation wherever ##a=1##. But I believe this being a Calculus research challenge it is anticipated on the OP to determine how to make it happen. Hints got earlier mentioned. https://gabletoppak.com/is-it-legal-to-sell-natural-mineral-water-in-gabletop-cartons-tetra-paks-and-aluminium-cans-in-india/