# Homework Help: Simple Contour Integral

1. Aug 12, 2014

### muzak

1. The problem statement, all variables and given/known data
|z| = 2, $\oint\frac{1}{z^3}$

2. Relevant equations
Cauchy's Integral Formula
http://en.wikipedia.org/wiki/Cauchy's_integral_formula

3. The attempt at a solution
Seems like a simple application of the general formula on the wiki page with n = 2, a = 0, and f(z) = 1. The higher order derivatives just yield zero, making the integral zero. Just asking for verification for a friend.

2. Aug 12, 2014

### Zondrina

You're using a circle of radius 2 as a contour. You could parametrize it with some $z(t)$, and then evaluate it. Think about $e$, and see what you get.