A set of functions, known as the trigonometric functions, allow you to extend the work of algebra and geometry in several directions. To understand the trigonometric functions, you can start by examining the ratios that exist between the angles and sides of a right triangle. To explore how these ratios are related to the activities previous chapters discussed, you can begin with an examination of the right triangle and how it relates to a line you generate using a linear equation.

Two of the angles of a right triangle are acute angles. In other words, they are angles of less than 90°. One is usually labeled as angle A. The other is labeled as angle B. A third angle is equal to 90°. According to the ...

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