My Desk of Integrals has the overall situation ##int frac dx x^2+a^two ## for a 'common' integral way too, not only the case where by ##a=one##. But I believe this becoming a Calculus research challenge it is anticipated on the OP to figure out how to get it done. Hints https://gabletoppak.com/india-leads-in-generating-plastic-waste-with-10-2-mn-tonnes-a-year-study/