# trigonometric function

## noun

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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Merriam-Webster unabridged
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