1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution I did part (a) which is pretty easy. Use the Cauchy integral formula. Part (b) says "hence", which leads me to believe that part (a) can be used for part (b), but I cannot see anything remotely related between the two. I don't want to do weird manipulations and substitutions if part (a) can help. If someone could help me out with this I would really appreciate it.