My table of Integrals has the final case ##int frac dx x^2+a^two ## being a 'conventional' integral far too, not only the case exactly where ##a=1##. But I feel this getting a Calculus homework problem it is expected of your OP to figure out how to make it happen. Hints https://gabletoppak.com/how-telanganas-amrabad-tiger-reserve-fights-back-against-its-biggest-threat-plastic/