Functions Modeling Change: A Preparation for Calculus, 5th Edition

Published by Wiley
ISBN 10: 1118583191
ISBN 13: 978-1-11858-319-7

Chapter 7 - Trigonometry and Periodic Functions - Strengthen Your Understanding - Page 320: 28



Work Step by Step

This is another way of saying that the function will at some point return to its original value. By definition, a function is periodic if and only if it does this, for if it does not, then it is not repeating itself and is hence not periodic.
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