My table of Integrals has the general circumstance ##int frac dx x^two+a^two ## like a 'normal' integral also, not just the situation where by ##a=one##. But I believe this getting a Calculus homework problem it is predicted with the OP to figure out how to do it. Hints were given https://gabletoppak.com/quenching-thirst-building-brands-how-free-water-campaigns-on-gable-top-cartons-create-impactful-brand-awareness/