My table of Integrals has the general situation ##int frac dx x^2+a^2 ## being a 'typical' integral much too, not just the case exactly where ##a=1##. But I believe this being a Calculus homework dilemma it is anticipated of your OP to figure out how to get it done. Hints https://gabletoppak.com/kerala-high-court-says-not-to-use-plastic-bottles-at-weddings-in-state/