Just after getting the constants A and B It is really reasonably straightforward to compute the integral ##int frac dx x^two + 9 ## as it could possibly now be prepared as two less complicated integrals. I tried but I simply cannot see how ##A,B## are constants? Gabletop Pak gives https://gabletoppak.com/why-gable-top-cartons-are-making-a-splash-in-the-water-industry/