Answer
$3(cos 90^\circ + isin90^\circ)$.
Work Step by Step
$3i$ is at $90^\circ$ with absolute value $\sqrt{0^2 + 3^2} =3$, the equivalent trigonometric form is $3cis90^\circ$ or $3(cos 90^\circ + isin90^\circ)$.
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 8 - Test - Page 412: 5a
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