Answer
$\sin \left( t+2\pi \right)=$ $\sin t$ and $\cos \left( t+2\pi \right)=$ $\cos t$ , so the sine and cosine functions are periodic functions. The period of each of these functions is $2\pi $.
Work Step by Step
Given above.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Concept and Vocabulary Check - Page 547: 12
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