My Desk of Integrals has the overall situation ##int frac dx x^two+a^2 ## to be a 'conventional' integral way too, not simply the situation where ##a=one##. But I do think this staying a Calculus homework issue it is predicted with the OP to figure out how to make it happen. https://gabletoppak.com/how-gable-top-pak-can-enhance-your-brand-and-customer-experience/