Quote Originally Posted by U-God View Post
Thanks again,

I handed my work in and it all looks good, however some of my friends said that they did it by using the form  x (A \cos x + B \sin x) .
You said here that that form wouldn't work and to move on to the next form up, so out of interest when I got home I tried it with form:  x (A \cos x + B \sin x) and lo and behold I got the same answer as with form: (x + C x^2) (A \cos x + B \sin x).

Does that mean I did something wrong?
Cheers,
It's the most general form .... If you got the same answer using  x (A \cos x + B \sin x) that would mean C = 0.

Actually I thought I read somewhere in a thread that trying  x (A \cos x + B \sin x) didn't work, but I must have only imagined I saw it.