## Precalculus (6th Edition) Blitzer

Published by Pearson

# Chapter 4 - Test - Page 647: 25

#### Answer

The trigonometric functions are defined for repeated cycles or phenomenon; they are periodic functions with a period of $2 \pi$ units and their graphs also repeat themselves after a definite interval of time.

#### Work Step by Step

For example: The Trigonometric function $\sin$ can be used to model the simple harmonic motion of a spring.

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