Answer
$-\frac{3}{2}+\frac{3\sqrt 3}{2}i$, see graph.
Work Step by Step
1. Based on the given conditions, we have:
$3(cos\frac{2\pi}{2}+i\ sin\frac{2\pi}{2})=3(-\frac{1}{2}+\frac{\sqrt 3}{2}i)=-\frac{3}{2}+\frac{3\sqrt 3}{2}i$
2. See graph.