Arccosine function. The arccosine is the angle whose cosine is number.

The arccosine, in radians, of a number.

Mathematical functions

ACos(number)

Cos, Sin, ASin, Tan, Atn, Pi

The range of the result is 0 to p.

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

<h3>ACos Example</h3>
<!--- output its arccosine value --->
<cfif IsDefined("FORM.CosNum")>
   <cfif IsNumeric(FORM.CosNum)>
      <cfif Abs(FORM.CosNum) LESS THAN OR EQUAL TO 1>
         <cfoutput>ACos(#FORM.CosNum#) = #ACos(FORM.cosNum)# Radians   </cfoutput>
         <br>or<br>
         <cfoutput>ACos(#FORM.CosNum#) = #ACos(FORM.cosNum) * 180/PI()#</
cfoutput>
      <cfelse>
         <!--- if it is empty, output an error message --->
         <h4>Enter a number between -1 and 1</h4>
      </cfif>
   </cfif>      
</cfif>

<form method="post" action = "acos.cfm">
<p>Enter 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>