Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 1 - Trigonometric Functions - Section 1.4 Using the Definitions of the Trigonometric Functions - 1.4 Exercises - Page 36: 16


$-1\leq\cos\theta\leq 1$

Work Step by Step

Cosine is the ratio of the x coordinate of a point to that point's distance from the origin. This means that the maximum value cosine could have is one (when (x,y) coordinates are (1,0)) It is impossible to have cosine value 1.5.
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