User Guide

ACos 375
ACos
Description
Arccosine function. The arccosine is the angle whose cosine is number.
Returns
The arccosine, in radians, of a number.
Category
Mathematical functions
Function syntax
ACos(number)
See also
Cos, Sin, ASin, Tan, Atn, Pi
Parameters
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
<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>
Parameter Description
number Cosine of an angle. The value must be between -1.0 and 1.0, inclusive.