Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 8 - Section 8.3 - Products and Quotients in Trigonometric Form - 8.3 Problem Set - Page 439: 23

Answer

$32+32i\sqrt {3}$

Work Step by Step

Using de Moivre's theorem ($z^{n}=r^{n} cis \,n\theta$ where $z=r\, cis\,\theta$ and $n$ is an integer), we get $[2(\cos 10^{\circ}+i\sin 10^{\circ})]^{6}=(2)^{6}(\cos 6\cdot10^{\circ}+i\sin 6\cdot10^{\circ})$ $=64(\cos 60^{\circ}+i\sin60^{\circ})$ In standard form, our result is $=64(\frac{1}{2}+i\cdot\frac{\sqrt 3}{2})$ $=32+32i\sqrt {3}$
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