Answer
Impossible.
Work Step by Step
For any value of $\theta$, we know that $\cos\theta\in$ [-1,1].
Because $1.5\gt1$, it is impossible to find a value of $\theta$ that satisfies $\cos\theta=1.5$
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 1 - Trigonometric Functions - Section 1.4 Using the Definitions of the Trigonometric Functions - 1.4 Exercises - Page 37: 8
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