Returns the angle, in radians, between the positive x-axis and the ray from the origin to the point (y, x), where x and y are the values of the two specified float expressions.
The following example calculates the ATN2 for the specified x and y components.
DECLARE @x float DECLARE @y float SET @x = 35.175643 SET @y = 129.44 SELECT 'The ATN2 of the angle is: ' + CONVERT(varchar,ATN2(@x,@y )) GO
Here is the result set.
The ATN2 of the angle is: 0.265345 (1 row(s) affected)