Trigonometric Functions (table). The Columbia Encyclopedia, Sixth Edition. 2001-07

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The Columbia Encyclopedia, Sixth Edition. 2001-07.

Trigonometric Functions (table)

Function (abbreviation)	Definition	Formula
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 Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press.

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