Answer
See the steps.
Work Step by Step
$\cos{(x-2\pi)} = \cos{x} \cos{2\pi} + \sin{x} \sin{2\pi}$
$\cos{(x-2\pi)} = \cos{x} \times 1 + \sin{x} \times 0 = \cos{x}$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 5 - Section 5.2 - Sum and Difference Formulas - 5.2 Problem Set - Page 288: 18
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