Answer
$\approx1.77$
Work Step by Step
With a calculator in radian mode, use the inverse cosine function then round the result to two decimal places to obtain
$\cos^{-1}{(-0.2)}=1.7722\approx1.77$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 7 - Analytic Trigonometry - Chapter Review - Review Exercises - Page 507: 78
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