ACos

Description

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

Syntax

ACos(number)

Parameters

Parameter

Description

number
Cosine of the angle to calculate. The value must be between -1 and 1, inclusive.

Parameter	Description
number	Cosine of the angle to calculate. The value must be between -1 and 1, inclusive.

Usage

The range of the result is 0 to π.

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

Example

<!--- 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>