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Trigonometric Functions

Trigonometric Functions

Function (abbreviation)DefinitionFormula
sine (sin)opposite / hypotenuse sin  A   =   a - c
cosine (cos)adjacent / hypotenuse cos  A   =   b - c
tangent (tan)opposite / adjacent tan  A   =   a - b
cotangent (cot or ctn)adjacent / opposite cot  A   =   b - a
secant (sec)hypotenuse / adjacent sec  A   =   c - b
cosecant (csc)hypotenuse / opposite csc  A   =   c - a

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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