ReferenceExcel FormulasSupported FormulasATAN2On this pageATAN2 The ATAN2 function returns the arctangent of the specified x- and y-coordinates in radians. Syntax =ATAN2(x, y) Parameters x: The x coordinate y: The y coordinate Examples =ATAN2(1, 1) // Returns 0.7854 (π/4 radians or 45 degrees)=ATAN2(0, 1) // Returns 0