Just After finding the constants A and B it's fairly easy to compute the integral ##int frac dx x^2 + 9 ## as it may now be published as two easier integrals. I attempted but I can't see how ##A,B## are constants? This really is supported by a very well-properly https://gabletoppak.com/kerala-get-ready-to-say-no-to-plastic-from-october-2/