ACos

Returns the arccosine of a number in radians. The arccosine is the angle whose cosine is number.

Syntax

ACos(number)

number

Cosine of the angle that is to be calculated. This value must be between -1 and 1, inclusive.

Usage

The range of the result is 0 to .

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

Examples

<!--- This example shows how to use ACos --->

<HTML>

<HEAD>
<TITLE>ACos Example</TITLE>
</HEAD>

<BODY BGCOLOR=silver>

<H3>ACos Example</H3>

<!--- output its arccosine value --->
<CFIF IsDefined("FORM.CosNum")>
    <CFIF IsNumeric(FORM.CosNum)>
        <CFIF FORM.CosNum LESS THAN OR EQUAL TO 1>
            <CFIF FORM.CosNum GREATER THAN OR EQUAL TO -1>
                ACos(<CFOUTPUT>#FORM.CosNum#</CFOUTPUT>) = 
<CFOUTPUT>#ACos(FORM.cosNum)# Radians</CFOUTPUT>
                <BR>
                or
                <BR>
                ACos(<CFOUTPUT>#FORM.CosNum#</CFOUTPUT>) = 
<CFOUTPUT>#Evaluate(ACos(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>
        <CFELSE>
<!--- if it is empty, output an error message --->
        <H4>Please enter a number between -1 and 1</H4>
        </CFIF>
    </CFIF>        
</CFIF>

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

<P><INPUT TYPE="Submit" NAME=""> <INPUT TYPE="RESET">

</FORM>

</BODY>

</HTML>

CFML Language Reference
Chapter 2 : ColdFusion Functions