Returns a **Double** specifying the cosine of an angle.

**Syntax**

**Cos(**
**
number
**

**)**

The required ** number**argument is a Double or any valid numeric expression that expresses an angle in radians.

**Remarks**

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.

## Example

**Note:** Examples that follow demonstrate the use of this function in a Visual Basic for Applications (VBA) module. For more information about working with VBA, select **Developer Reference** in the drop-down list next to **Search** and enter one or more terms in the search box.

This example uses the **Cos** function to return the cosine of an angle.

```
```Dim MyAngle, MySecant

MyAngle = 1.3 ' Define angle in radians.

MySecant = 1 / Cos(MyAngle) ' Calculate secant.