trigonometric function

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Trigonometric functions
In mathematics, the trigonometric functions (also called the circular functions) are functions of an angle. They relate the angles of a triangle to the lengths of its sides. Trigonometric functions are important in the study of triangles and modeling periodic phenomena, among many other applications.

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trigonometric function

Noun
1. function of an angle expressed as a ratio of the sides of right-angled triangle containing the angle
(synonym) circular function
(hypernym) function, mathematical function
(hyponym) sine, sin