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ATN Function Details
 
Syntax
  ATN(numeric-expression)
 
The numeric-expression can be of any numeric type.
 
ATN is evaluated by default in single precision. If numeric-expression is
a double-precision value, ATN is evaluated in double precision.
 
The result is given in radians and is in the range -π/2 to π/2 radians,
where π = 3.141593. π/2 radians equals 90 degrees.
 
You can convert an angle measurement from degrees to radians by
multiplying the degrees by π/180, where π = 3.141593.
 
To convert a radian value to degrees, multiply it by 57.2958.