# Cos

Returns the cosine of a given angle in radians.

See also Sin, Tan, and Pi.

### Syntax

    Cos(number)

##### number

Angle in radians for which you want the cosine.

### Usage

The range of the result is -1 to 1.

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

### Examples

    <!--- This snippet shows how to use Cos --->
    <HTML>
    <HEAD>
    <TITLE>
    Cos Example
    </TITLE>
    </HEAD>

    <BODY BGCOLOR=silver>
    <H3>Cos Example</H3>

    <!--- output its Cos value --->
    <CFIF IsDefined("FORM.CosNum")>
        <CFIF IsNumeric(#FORM.CosNum#)>
            Cos(<CFOUTPUT>#FORM.CosNum#</CFOUTPUT>) =
              <CFOUTPUT>#Cos(FORM.cosNum)#
            radians = #Evaluate(Cos(FORM.cosNum) * 180/PI())#
              Degrees</CFOUTPUT>
        <CFELSE>
    <!--- if it is empty, output an error message --->
            <H4>Please enter a number between -1 and 1</H4>
        </CFIF>
    </CFIF>

    <FORM ACTION="cos.cfm" METHOD="POST">
    <P>Type in a number to get its cosine in Radians and Degrees
    <BR><INPUT TYPE="Text" NAME="cosNum" size="25">
    <P><INPUT TYPE="Submit" NAME=""> <INPUT TYPE="RESET">
    </FORM>

    </BODY>
    </HTML>