Immediately after obtaining the constants A and B It really is reasonably easy to compute the integral ##int frac dx x^two + nine ## as it could now be created as two simpler integrals. I tried but I are unable to see how ##A,B## are constants? Photon 'time bins' and https://gabletoppak.com/aseptic-tetra-pak-vs-non-aseptic-gable-top-choosing-the-right-carton-for-your-needs/