# Cos Function

Returns the cosine of an angle.

Cos(number)

The number argument can be any valid numeric expression that expresses an angle in radians.

The **Cos** function takes an angle and returns the ratio of two sides of a right triangle. The ratio is the length of the side adjacent to the angle divided by the length of the hypotenuse. The result lies in the range -1 to 1.

To convert degrees to radians, multiply degrees by pi /180. To convert radians to degrees, multiply radians by 180/pi.

The following example uses the **Cos** function to return the cosine of an angle:

## Community Additions

Show: