Correspondence Between Geometric and Differential Definitions of the Sine and Cosine
Abstract:In textbooks, the familiar sine and cosine functions appear in two forms: geometrical, in the treatment of unit circles and triangles, and differential, as solutions of differential equations. These two forms correspond to two different definitions of trigonometric functions. By using elementary geometry and elementary calculus, it is shown that the two definitions are equivalent.
Document Type: Research Article
Publication date: January 1, 2014
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