\<bookmark_value\>Cos function\</bookmark_value\>

# Cos Function

Calculates the cosine of an angle. The angle is specified in radians. The result lies between -1 and 1.

Using the angle Alpha, the Cos-Function calculates the ratio of the length of the side that is adjacent to the angle, divided by the length of the hypotenuse in a right-angled triangle.

## Syntax:

``````
Cos (Number)
``````

Double

## Parameters:

\<emph\>Number:\</emph\> Numeric expression that specifies an angle in radians that you want to calculate the cosine for.

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

Pi is here the fixed circle constant with the rounded value 3.14159...

### Error codes:

5 Invalid procedure call

## Example:

``````
REM The following example allows for a right-angled triangle the input of
REM secant and angle (in degrees) and calculates the length of the hypotenuse:
Sub ExampleCosinus
REM rounded Pi = 3.14159
Dim d1 As Double, dAngle As Double