My table of Integrals has the final case ##int frac dx x^2+a^2 ## to be a 'conventional' integral too, not merely the case the place ##a=1##. But I believe this currently being a Calculus research issue 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/