My Desk of Integrals has the general scenario ##int frac dx x^two+a^two ## for a 'standard' integral far too, not just the situation in which ##a=1##. But I do think this becoming a Calculus homework trouble it is anticipated with the OP to figure out how to make it happen. https://gabletoppak.com/quenching-thirst-building-brands-how-free-water-campaigns-on-gable-top-cartons-create-impactful-brand-awareness/