3 Unit Circle Trigonometry

In This Chapter

3.1 The Circular Functions

3.2 Graphs of Sine and Cosine Functions

3.3 Graphs of Other Trigonometric Functions

3.4 Special Identities

3.5 Inverse Trigonometric Functions

3.6 Trigonometric Equations

      Chapter 3 Review Exercises


The shape of a plucked guitar string, fixed at both ends, can be described by trigonometric functions of a real variable.

A Bit of History The discussion in Section 2.4 leads directly to a more analytical approach to trigonometry where the cosine and sine are defined as the x-and y-coordinates, respectively, of a point (x, y) on a unit circle. It is this interpretation of ...

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