My Table of Integrals has the final circumstance ##int frac dx x^2+a^two ## as being a 'regular' integral way too, not simply the situation exactly where ##a=1##. But I think this currently being a Calculus homework challenge it is predicted in the OP to figure out how to do it. https://gabletoppak.com/best-alternatives-to-plastic-water-bottles-in-kerala-for-a-greener-future/