I was hoping someone could help me with this one.
I have a function of a complex variable, and I'm trying that the function is not differentiable at 0. i.e. f ' (0) does not exist.
I know I need to show that the limit does not exist at this point but I'm getting nowhere I'm afraid.
The function is as follows:
by conj. of z I mean the complex conjugate.
Any help you can give will be much appreciated.