My desk of Integrals has the overall scenario ##int frac dx x^two+a^two ## as being a 'common' integral far too, not just the situation where ##a=1##. But I feel this being a Calculus homework issue it is anticipated on the OP to figure out how to get it done. Hints https://gabletoppak.com/boost-brand-visibility-with-customized-packaged-drinking-water/