Solve where s and b are constants. I have tried undetermined coefficients, but it makes such a mess that I keep getting lost, I also tried variation of parameters. Really my issue is staying organized enough to get the solution, my solutions are always just a little off from the book.
I have solved the complementary homogenous equation, this gave me a solution with in it... So that's off limits in the particular solution. I looked for a solution in xsinsx and , but as I said, it was a mess.