Atn

Returns the arctangent of a number

Syntax
   Declare Function Atn ( ByVal number As Double ) As Double

Usage
   result = Atn( number )

Parameters
   number
      A number.

Return Value
   The angle, in radians, whose tangent is number, in the range 
   [-Pi/2..Pi/2].

Description
   Atn returns the arctangent of the argument number as a Double within the 
   range of -Pi/2 to Pi/2.  The arctangent is the inverse of the Tan 
   function. The returned angle is measured in radians (not degrees).

   Atn can be overloaded as operator to accept user-defined types.

Example
   Print "Pi ="; Atn ( 1.0 ) * 4
   Print Atn ( 4 / 5 )

The output would be:

   Pi = 3.141592653589793
   0.6747409422235527

Differences from QB
   * None

See also
   * Tan
   * Atan2
   * A Brief Introduction To Trigonometry

