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Introduction

described in detail following the image — Figure 1.1.

The world is full of natural occurrences that repeat themselves in predictable, periodic ways. Sound waves, radio waves, AC electrical currents, seasonal temperature changes, and ocean tides are just a few examples of periodic phenomena which can be modeled by so called “trigonometric” functions.

In this chapter, we introduce periodic functions and the unit circle and explore connections between them.

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