Answer
$-i$
Work Step by Step
Step 1: $i^{15}=i^{14+1}=i^{14}\times i$=$(i^{2})^{7}\times i$
Step 2: As $i^{2}=-1$,
$(i^{2})^{7}\times i=(-1)^{7}\times i=-1\times i=-i$
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: 3a
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