My table of Integrals has the final case ##int frac dx x^2+a^two ## as being a 'regular' integral far too, not just the case wherever ##a=1##. But I think this getting a Calculus research difficulty it is predicted of your OP to determine how to do it. Hints were given https://gabletoppak.com/why-i-switched-to-water-in-a-sustainable-box/