My desk of Integrals has the overall situation ##int frac dx x^two+a^2 ## being a 'typical' integral way too, not simply the situation exactly where ##a=1##. But I do think this being a Calculus research issue it is expected on the OP to figure out how to make it happen. https://gabletoppak.com/why-gable-top-cartons-are-making-a-splash-in-the-water-industry/