Thank you,
I have few questions
1. Is it that you choose [itex] (z  i) [/itex] terms because the question specifies it should converge in [itex] 0 < zi < R [/itex] ?
2. So [itex]\frac{B}{z + i} [/itex] will be expanded like
[itex]\frac{1}{2i} * \frac{1}{1+\frac{zi}{2i}} = \sum_{n=0}^{\infty}{s^n}[/itex]
where
[itex] s = \frac{zi}{2i}[/itex]
so the answer to the solution would be
[itex]\frac{A}{zi} + \{expansion\, in\, 2\}[/itex] ?
Thanks again
