Answer
$120^o$
Work Step by Step
The value of $\theta$ must be in the interval $[0^o, 180^o]$.
Note that $\cos{120^o} = -\frac{1}{2}$.
Thus, $\arccos{\left(-\frac{1}{2}\right)}=120^o$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 6 - Inverse Circular Functions and Trigonometric Equations - Section 6.1 Inverse Circular Functions - 6.1 Exercises - Page 264: 41
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