My desk of Integrals has the final scenario ##int frac dx x^2+a^two ## for a 'standard' integral way too, not only the case exactly where ##a=1##. But I believe this remaining a Calculus homework difficulty it is predicted with the OP to figure out how to make it happen. Hints https://gabletoppak.com/gabletop-pak-leading-the-way-as-milk-carton-manufacturers-in-india/