My desk of Integrals has the general case ##int frac dx x^two+a^two ## being a 'conventional' integral as well, not only the case the place ##a=one##. But I do think this being a Calculus homework difficulty it is anticipated with 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/