Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 6 - Review Exercises - Page 285: 23

Answer

$-1$

Work Step by Step

RECALL: Since cosine and arccosine are inverse functions of each other, then, for all valid values of $x$, $\cos{(\cos^{-1}(x))}=x$ Thus, $\cos{(\arccos{(-1)})}=-1$
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