Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 8 - Section 8.3 - Polar Form of Complex Numbers; De Moivre's Theorem - 8.3 Exercises - Page 611: 80

Answer

$w_0=2[cos~0+i~sin~0]$ $w_1=2[cos(\frac{2\pi}{5})+i~sin(\frac{2\pi}{5})]$ $w_2=2[cos(\frac{4\pi}{5})+i~sin(\frac{4\pi}{5})]$ $w_3=2[cos(\frac{6\pi}{5})+i~sin(\frac{6\pi}{5})]$ $w_3=2[cos(\frac{8\pi}{5})+i~sin(\frac{8\pi}{5})]$

Work Step by Step

$r=|z|=32$ $θ=0~~$ (Positive real axis) Polar form: $z=32(cos~0+i~sin~0)$ $w_k=\sqrt[5] {32}[cos(\frac{0+2k\pi}{5})+i~sin(\frac{0+2k\pi}{5})]$ $w_0=2[cos~0+i~sin~0]$ $w_1=2[cos(\frac{2\pi}{5})+i~sin(\frac{2\pi}{5})]$ $w_2=2[cos(\frac{4\pi}{5})+i~sin(\frac{4\pi}{5})]$ $w_3=2[cos(\frac{6\pi}{5})+i~sin(\frac{6\pi}{5})]$ $w_3=2[cos(\frac{8\pi}{5})+i~sin(\frac{8\pi}{5})]$
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