cofunction

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co·func·tion

C0459800 (kō′fŭngk′shən)n. The trigonometric function of the complement of an angle: The tangent is the cofunction of the cotangent.

cofunction

(ˌkəʊˈfʌŋkʃən) n1. a joint function2. (Mathematics) maths the trigonometric function of the complement of a given angle

co•func•tion

(ˈkoʊˌfʌŋk ʃən)

n. the trigonometric function of the complement of a given angle or arc: cosθ is the cofunction of sinθ. [1905–10]