Two links below one is the problem sheet and one is the solution sheet.
I'm stuck on question 3 . There are two parts of the solution I don't quite understand.
The very first line
z^n-z(0)^n= that expansion. How did he get this?
and also a little bit further down where he states that the
co-efficient of z^-1 on RHS is ... I cant seem to get what he gets correctly.
Thanks a lot.
Got a big exam on monday so any help is appreciated.