Answer
$${\bf{u}} = - 4i$$
Work Step by Step
$$\eqalign{
& {\text{Let }}{\bf{u}} = - 4i \cr
& {\text{Graph}} \cr} $$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 8 - Application of Trigonometry - 8.5 Trigonometric (Polar) Form of Complex Numbers: Products and Quotients - 8.5 Exercises - Page 800: 17
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