# Category:Cosine Function

This category contains results about the cosine function.
Definitions specific to this category can be found in Definitions/Cosine Function.

In the above right triangle, we are concerned about the angle $\theta$.

The cosine of $\angle \theta$ is defined as being $\dfrac {\text{Adjacent}} {\text{Hypotenuse}}$.

## Also see

Category:Sine Function
Category:Tangent Function
Category:Cotangent Function
Category:Secant Function
Category:Cosecant Function