Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 8 - Test - Page 412: 6b



Work Step by Step

$4$ cis $40^{\circ}$=$4(\cos40^{\circ}+i\sin40^{\circ})$ Using a calculator, we find that $\cos40^{\circ}=0.76604$ and $\sin40^{\circ}=0.64279$ Substituting these values in the expression and solving: $4(\cos40^{\circ}+i\sin40^{\circ})=4(0.76604+0.64279i)=3.0642+2.5712i$
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