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
Parameter | Description
number | Tangent of an angle
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>) =
         <cfoutput>#Atn(FORM.AtnNum)# radians =
          #Evaluate(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 = "atn.cfm">
    <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