SINCE 1828
trigonometric function
nounDefinition of trigonometric function
1
: a function (such as the sine, cosine, tangent, cotangent, secant, or cosecant) of an arc or angle most simply expressed in terms of the ratios of pairs of sides of a right-angled triangle
— called also circular function
2
: the inverse (such as the arcsine, arccosine, or arctangent) of a trigonometric function
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