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>