## trigonometric function

any of the basic functions (as sine, cosine, tangent, etc.) of an angle or arc, usually expressed as the ratio of pairs of sides of a right triangle

## trigonometric function

noun

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**

In a right triangle, the three main trigonometric functions are

sine &thgr; = opposite / hypotenuse

cosine &thgr; = adjacent / hypotenuse

tangent &thgr; = opposite / adjacent.

## trigonometric function

Noun

(*plural* trigonometric functions)

- (trigonometry) Any function of an angle expressed as the ratio of two of the sides of a right triangle that has that angle, or various other functions that subtract 1 from this value or subtract this value from 1 (such as the versed sine)

- cosecant
- cosine
- cotangent
- coversed sine
- excosecant
- exsecant
- hacoversed sine
- haversed sine
- secant
- sine
- tangent
- trigonometry
- versed sine