My Desk of Integrals has the final case ##int frac dx x^2+a^two ## to be a 'normal' integral much too, not just the case where by ##a=one##. But I think this staying a Calculus homework trouble it is anticipated from the OP to determine how to do it. Hints were https://gabletoppak.com/how-gable-top-pak-can-enhance-your-brand-and-customer-experience/