Category:Definitions/Cofunctions

This category contains definitions related to Cofunctions.
Related results can be found in Category:Cofunctions.

Let $f$ be a trigonometric function

Then $g$ is a cofunction of $f$ if and only if:

$\forall x \in \R: \map g x = \map f {90 \degrees - x}$

That is, such that the image of $x$ under $f$ equals the image of the complement of $x$ under $g$.