Abstract
This chapter discusses the circular functions of trigonometry. The word trigonometryderives from the Greek meaning measurement of triangles. The conventional approach to the subject matter of trigonometry deals with relationships between the sides and angles of a triangle, reflecting the important applications of trigonometry in such fields as navigation and surveying. The modern approach is to deal with trigonometry in terms of functional relationships. The trigonometric functions can be viewed as functions whose domains are angles or as functions whose domains are real numbers, in which case they are often referred to as the circular functions. The latter approach more clearly demonstrates the utility of the function concept.
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