My table of Integrals has the final situation ##int frac dx x^2+a^two ## as being a 'conventional' integral way too, not merely the situation exactly where ##a=one##. But I believe this being a Calculus homework issue it is predicted on the OP to determine how to make it happen. Hints https://gabletoppak.com/why-gable-top-cartons-are-making-a-splash-in-the-water-industry/