My table of Integrals has the overall scenario ##int frac dx x^two+a^2 ## as being a 'typical' integral as well, not merely the case where ##a=1##. But I think this getting a Calculus research trouble it is expected on the OP to figure out how to get it done. Hints https://gabletoppak.com/how-telanganas-amrabad-tiger-reserve-fights-back-against-its-biggest-threat-plastic/