atan ( numeric_expression )
returns float_expression
Computes the arc-tangent of an angle expressed in radians (0 to 2pi).
Abs, Acos, Asin, Atan, Ceil, Cos, Degrees, Exp, Float, Floor, Int, IsNumeric, Log, Log10, Radians, Rand, Round, Seed, Sin, Sqr, Tan