My desk of Integrals has the general scenario ##int frac dx x^two+a^2 ## like a 'conventional' integral also, not merely the situation in which ##a=one##. But I do think this being a Calculus homework dilemma it is expected from the OP to determine how to make it happen. Hints got https://gabletoppak.com/kerala-high-court-says-not-to-use-plastic-bottles-at-weddings-in-state/