# Math Help - [SOLVED] Complex Analysis

1. ## [SOLVED] Complex Analysis

How do I solve these?

2. I have solved this sorry.

3. I have solved part a of this but not b

4. $f'(0) = \lim_{z\to 0} \frac{f(z)-f(0)}{z-0} = \lim_{z\to 0} \frac{2z\bar z}{z} = \lim_{z\to 0}2\bar z = ?$