Answer
The two angles are coterminal, therefore they have the same cosine value.
Work Step by Step
1. $\theta$ and $\theta + 360^{\circ}n$ are coterminal.
Coterminal angles have the same values of cosine ( x axis of coordinate).
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 2 - Acute Angles and Right Triangles - Section 2.2 Trigonometric Functions of Non-Acute Angles - 2.2 Exercises - Page 60: 72
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