Answer
$3i$
Work Step by Step
We know that $\cos90^{\circ}=0$ and $\sin90^{\circ}=1$
Substituting these values in the expression and solving:
$3(\cos90^{\circ}+i\sin90^{\circ})=3(0+1i)=3i$
Therefore, the rectangular form is $3i$.
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 8 - Test - Page 407: 6c
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