Answer
See graph, $3(cos270^\circ+i\ sin270^\circ)$
Work Step by Step
1. See graph for $z=0- 3i$
2. $z=0- 3i=3(0-i)=3(cos270^\circ+i\ sin270^\circ)$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 8 - Polar Coordinates; Vectors - Section 8.3 The Complex Plane; De Moivre's Theorem - 8.3 Assess Your Understanding - Page 614: 15
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