Answer
$2.42\ rad$.
Work Step by Step
Use a calculator, we can find $cos^{-1}(-0.75)=\pi-cos^{-1}(0.75)\approx2.42\ rad$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 10 - Systems of Equations and Inequalities - Section 10.2 Systems of Linear Equations: Matrices - 10.2 Assess Your Understanding - Page 752: 95
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