Trigonometric Functions

Trigonometric Functions
Function (abbreviation)DefinitionFormula
sine (sin)opposite / hypotenusesin A =  a\\overc
cosine (cos)adjacent / hypotenusecos A =  b\\overc
tangent (tan)opposite / adjacenttan A =  a\\overb
cotangent (cot or ctn)adjacent / oppositecot A =  b\\overa
secant (sec)hypotenuse / adjacentsec A =  c\\overb
cosecant (csc)hypotenuse / oppositecsc A =  c\\overa

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

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