# COS

Returns the cosine of an angle.

## Synopsis

COS(number)

### Arguments

number | An expression that resolves to a number that expresses an angle in degrees. |

## Description

The COS function takes an angle in degrees 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. This ratio is in the range of 1 to -1 (inclusive).

## Examples

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

```
Dim MyAngle
MyAngle = 1.3; ! Define angle in degrees.
PRINT COS(MyAngle); ! Returns cosine ratio.
```

The following example uses the COS function to return the secant of an angle:

```
Dim MyAngle, MySecant
MyAngle = 1.3; ! Define angle in degrees.
MySecant = 1 / Cos(MyAngle); ! Calculate secant.
Print MySecant; ! Secant in radians.
```