Multivariable Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 0-53849-787-4
ISBN 13: 978-0-53849-787-9

Appendix G - Exercises - Page A12: 44

Answer

$-1$

Work Step by Step

To write the number as $a+bi$, we apply Euler's formula, $e^{iy}=\cos{y}+i\sin{y}$ $e^{-i\pi}=\cos(-\pi)+i\sin(-\pi)$ $=-1+i \times 0$ $=-1$
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