I don't know what I should do because of the logarithm function, the exercise has come after introducing the undetermined coefficients methods, so I assume it should be solved that way but I don't know how.
well, that's obviously the general solutions of the homogenous question, but how to find .
I don't know what the method of variation of parameters is, but I solved it through the method that we take and then we look for . It was finally solved but I wonder why the author has put it in the section of undetermined coefficients method, is it possible to solve this with that method too? I doubt.