ATN |
Description Arctangent function. The arctangent is the angle whose tangent is number.
Returns The arctangent, in radians, of a number.
Category Mathematical functions
Function syntax
    Atn(number)
See also Atn, Sin, ASin, Cos, ACos, Pi
Parameters
Usage The range of the result is -p/2 to p/2 radians. To convert degrees to radians, multiply degrees by p/180. To convert radians to degrees, multiply radians by 180/p.
Example
    <h3>Atn Example</h3>
    <!--- output its Atn value --->
    <cfif IsDefined("FORM.AtnNum")>
       <cfif IsNumeric(FORM.AtnNum)>
          Atn(<cfoutput>#FORM.AtnNum#</cfoutput>) is
         <cfoutput>#Atn(FORM.AtnNum)# radians is #Atn(FORM.AtnNum * 180/PI())#
    Degrees</cfoutput>
       <cfelse>
    <!--- if it is empty, output an error message --->
          <h4>Enter a number</h4>
       </cfif>
    </cfif>
    <form action = "evaltest.cfm" method="post">
    <p>Enter a number to get its arctangent in Radians and Degrees
    <br><input type = "Text" name = "atnNum" size = "25">
    <p><input type = "Submit" name = ""> <input type = "RESET">
    </form>

NUMBER |

Tangent of an angle