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,
$\cos{(\arccos{(-1)})}=-1$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 6 - Review Exercises - Page 285: 23
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