My desk of Integrals has the overall case ##int frac dx x^two+a^two ## being a 'common' integral way too, not only the situation wherever ##a=one##. But I do think this currently being a Calculus homework trouble it is predicted in the OP to figure out how to do it. Hints https://gabletoppak.com/customized-packaged-drinking-water-with-your-brand-logo/