My table of Integrals has the final scenario ##int frac dx x^two+a^2 ## like a 'typical' integral much too, not just the case wherever ##a=1##. But I think this being a Calculus homework difficulty it is predicted with the OP to determine how to do it. Hints were given over. https://gabletoppak.com/best-alternatives-to-plastic-water-bottles-in-kerala-for-a-greener-future/