# trigonometric function

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**trigonometric function**

In a right triangle, the three main trigonometric functions are

sine θ = opposite / hypotenuse

cosine θ = adjacent / hypotenuse

tangent θ = opposite / adjacent.

## trigonometric function

*n.*

A function of an angle expressed as the ratio of two of the sides of a right triangle that contains that angle; the sine, cosine, tangent, cotangent, secant, or cosecant. Also called

*circular function*.## trigonometric function

*n*

**1.**(Mathematics) 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

**2.**(Mathematics) any function containing only sines, cosines, etc, and constants

## trig′onomet′ric func′tion

*n.*

a function of an angle, as the sine or cosine, expressed as the ratio of the sides of a right triangle.

Also called **circular function.**

[1905–10]

**trigonometric function**

In a right triangle, the trigonometric functions are: sine θ =

^{opposite}/_{hypothenuse}cosine θ =^{adjacent}/_{hypothenuse}tangent θ =^{opposite}/_{adjacent}## trig·o·no·met·ric 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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Noun | 1. | trigonometric function - function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the anglefunction, mapping, mathematical function, single-valued function, map - (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function) sine, sin - ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle arc sine, arcsin, arcsine, inverse sine - the inverse function of the sine; the angle that has a sine equal to a given number arc cosine, arccos, arccosine, inverse cosine - the inverse function of the cosine; the angle that has a cosine equal to a given number arc tangent, arctan, arctangent, inverse tangent - the inverse function of the tangent; the angle that has a tangent equal to a given number arc cotangent, arccotangent, inverse cotangent - the inverse function of the cotangent; the angle that has a cotangent equal to a given number arc secant, arcsec, arcsecant, inverse secant - the inverse function of the secant; the angle that has a secant equal to a given number |

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