# trigonometric function

- Also called circular function. a function of an angle, as sine or cosine, expressed as the ratio of the sides of a right triangle.
- any function involving only trigonometric functions and constants.
- the generalization of these to functions of real or complex numbers.

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## Origin of trigonometric function^{}

First recorded in 1905–10

Also called trig function (for defs 1, 2).

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## trigonometric function

- Also called: circular function any of a group of functions of an angle expressed as a ratio of two of the sides of a right-angled triangle containing the angle. The group includes sine, cosine, tangent, secant, cosecant, and cotangent
- any function containing only sines, cosines, etc, and constants

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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## trigonometric function

[trĭg′ə-nə-mĕt′rĭk]

- A function of an angle, as the sine, cosine, or tangent, whose value is expressed as a ratio of two of the sides of the right triangle that contains the angle.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.