Right after locating the constants A and B It truly is reasonably uncomplicated to compute the integral ##int frac dx x^2 + 9 ## as it can now be created as two simpler integrals. I attempted but I simply cannot see how ##A,B## are constants? The life of a roof https://gabletoppak.com/why-gable-top-cartons-are-making-a-splash-in-the-water-industry/