Answer
$-1.0261-2.8191i$
Work Step by Step
$\cos250^{\circ}=-0.34202$ and $\sin250^{\circ}=-0.93969$
Substituting these values in the question,
$3(\cos250^{\circ}+i\sin250^{\circ})=3(-0.34202+i(-0.93969))=3(-0.34202-0.93969i)=-1.0261-2.8191i$
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 - Complex Numbers, Polar Equations, and Parametric Equations - Section 8.2 Trigonometric (Polar) Form of Complex Numbers - 8.2 Exercises - Page 371: 57
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