# Cos Function

Returns a Double specifying the cosine of an angle.

Syntax

Cos( number )

The required numberargument 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, MySecantMyAngle = 1.3 ' Define angle in radians.MySecant = 1 / Cos(MyAngle) ' Calculate secant. ```
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