My desk of Integrals has the final circumstance ##int frac dx x^two+a^two ## as being a 'common' integral far too, not merely the situation wherever ##a=1##. But I believe this becoming a Calculus research trouble it is predicted on the OP to figure out how to do it. Hints got https://gabletoppak.com/why-gabletop-cartons-outshine-pet-bottles-for-branding-opportunities/