Answer
Possible.
Work Step by Step
The range of $\cos\theta$ is [-1,1] and it can have any value from -1 to 1.
As -0.56 is included in this range, it is possible to find a value of $\theta$ that satisfies $\cos\theta=-0.56$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 5 - Trigonometric Functions - 5.2 Trigonometric Functions - 5.2 Exercises - Page 520: 124
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