Abstract
The word trigonometry is derived from Greek, meaning measurement of triangles. The conventional approach to the subject matter of trigonometry deals with relationships among the sides and angles of a triangle, reflecting the important applications of trigonometry in fields such as navigation and surveying. The modern approach to trigonometry emphasizes the function concept. This has become the accepted approach, because it demonstrates the unifying influence of the function concept. This chapter defines this important class of functions and discusses their fundamental properties and graphs. It discusses trigonometry in terms of functions of angles and real numbers. It also discusses the inverse trigonometric functions.
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