My desk of Integrals has the overall scenario ##int frac dx x^2+a^2 ## being a 'common' integral way too, not just the case in which ##a=1##. But I do think this being a Calculus research dilemma it is anticipated of your OP to figure out how to get it done. https://gabletoppak.com/quenching-thirst-building-brands-how-free-water-campaigns-on-gable-top-cartons-create-impactful-brand-awareness/