My Desk of Integrals has the general case ##int frac dx x^two+a^two ## for a 'normal' integral also, not just the situation wherever ##a=1##. But I think this currently being a Calculus research difficulty it is expected of your OP to determine how to get it done. Hints were given https://gabletoppak.com/how-white-label-water-bottles-can-skyrocket-your-business/