cofunction

[ koh-fuhngk-shuh n ]
/ ˈkoʊˌfʌŋk ʃən /

noun Trigonometry.

the function of the complement of a given angle or arc: cosθ is the cofunction of sinθ.

Origin of cofunction

First recorded in 1905–10; co- + function

Scientific definitions for cofunction

cofunction
[ kōfŭngk′shən ]

The trigonometric function of the complement of an angle. The tangent, for example, is the cofunction of the cotangent.