My table of Integrals has the final situation ##int frac dx x^two+a^2 ## like a 'common' integral much too, not simply the situation exactly where ##a=one##. But I think this remaining a Calculus research trouble it is anticipated from the OP to figure out how to make it happen. Hints https://gabletoppak.com/india-emerges-as-the-largest-plastic-polluter-globally/