Just after acquiring the constants A and B it's rather uncomplicated to compute the integral ##int frac dx x^2 + 9 ## as it may possibly now be prepared as two less difficult integrals. I attempted but I cannot see how ##A,B## are constants? Gabletop Pak provides an extensive array https://gabletoppak.com/best-alternatives-to-plastic-water-bottles-in-kerala-for-a-greener-future/