Trigonometric Functions

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Trigonometric Functions

Trigonometric Functions

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

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trigonometric function

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

trigonometric function Six ratios of the sides of a right-angled triangle containing a given acute angle – they are the sine, cosine, tangent, cotangent, secant, and cosecant of the angle. These functions can be extended to cover angles of any size by the use of a system of rectangular co-ordinates.

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