My desk of Integrals has the overall case ##int frac dx x^two+a^2 ## like a 'regular' integral far too, not just the situation where ##a=1##. But I think this getting a Calculus homework dilemma it is predicted of your OP to determine how to do it. Hints were given above. https://gabletoppak.com/india-emerges-as-the-largest-plastic-polluter-globally/