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# trigonometric function

## noun

,

*Mathematics.*- 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.

trigonometric function

## noun

- Also calledcircular 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

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.

## Discover More

## Word History and Origins

Origin of trigonometric function^{1}

First recorded in 1905–10

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