Cauchy-Goursat Theorem/Examples/z squared over e to the it

Example of Use of Cauchy-Goursat Theorem
Let $\map \gamma t = e^{i t}$.

Let the domain of $\gamma$ be $\hointr 0 {2 \pi}$.

Let $\map f z = z^2$.

Then:
 * $\ds \oint_\gamma \map f z \rd z = 0$