Also called circular function. a function of an angle, as sine or cosine, expressed as the ratio of the sides of a right triangle.
2.
any function involving only trigonometric functions and constants.
3.
the generalization of these to functions of real or complex numbers.
Also called trig function (for defs 1, 2).
Origin
1905-10
British Dictionary definitions for trigonometric functions
trigonometric function
noun
1.
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.
any function containing only sines, cosines, etc, and constants
trigonometric functions in Science
trigonometric function
(trĭg'ə-nə-mět'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.