My Desk of Integrals has the overall case ##int frac dx x^two+a^two ## to be a 'typical' integral also, not simply the case the place ##a=one##. But I feel this becoming a Calculus research dilemma it is expected of your OP to figure out how to make it happen. Hints https://gabletoppak.com/the-growing-threat-of-marine-pollution-and-how-gabletop-cartons-offer-a-solution/