My table of Integrals has the general situation ##int frac dx x^2+a^2 ## like a 'typical' integral too, not just the case the place ##a=one##. But I think this remaining a Calculus homework trouble it is anticipated from the OP to determine how to do it. Hints got above. Gable https://gabletoppak.com/kerala-high-court-says-not-to-use-plastic-bottles-at-weddings-in-state/