Answer
Impossible.
Work Step by Step
1.5 is outside the range [-1,1] of cosine function. Thus, the statement $\cos\theta=1.5$ is not possible.
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 518: 8
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