Answer
$$-1.$$
Work Step by Step
Since $j=\sqrt{-1}$, $j^2=-1$, $j^4=1$, we have
$$ j^6=j^4j^2=-1.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 11 - Section 11.5 - Imaginary Numbers - Exercise - Page 378: 14
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