My Desk of Integrals has the final case ##int frac dx x^2+a^two ## as being a 'normal' integral far too, not merely the situation where by ##a=one##. But I do think this being a Calculus homework issue it is expected in the OP to figure out how to do it. https://gabletoppak.com/how-white-label-water-bottles-can-skyrocket-your-business/