55 Introduction to Trigonometric Identities and Equations

Figure 1. A sine wave models disturbance. (credit: modification of work by Mikael Altemark, Flickr).

Math is everywhere, even in places we might not immediately recognize. For example, mathematical relationships describe the transmission of images, light, and sound. The sinusoidal graph in (Figure) models music playing on a phone, radio, or computer. Such graphs are described using trigonometric equations and functions. In this chapter, we discuss how to manipulate trigonometric equations algebraically by applying various formulas and trigonometric identities. We will also investigate some of the ways that trigonometric equations are used to model real-life phenomena.

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PPSC MAT 1420: Algebra and Trigonometry by OpenStax is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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