cofunction

[koh-fuhngk-shuhn]

noun

Trigonometry.

1. the function of the complement of a given angle or arc.

   cosθ is the cofunction of sinθ.

cofunction

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

Word History and Origins

Origin of cofunction¹

First recorded in 1905–10; co- + function

Example Sentences

At a time when Florida is banning the acknowledgment of gender fluidity or any identity outside male and female, this subversive textbook unabashedly tells suggestible children that such things exist as “reciprocal identities,” “cofunction identities,” “additive identity property” and even “multiplicative identity property.”

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