I handed my work in and it all looks good, however some of my friends said that they did it by using the form .
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: and lo and behold I got the same answer as with form: .
Does that mean I did something wrong?
It's the most general form .... If you got the same answer using that would mean C = 0.
Actually I thought I read somewhere in a thread that trying didn't work, but I must have only imagined I saw it.