Acos Acosh Asin Asinh Atan2 Atanh Cosh Cospi Cospi_sub Exp2 Exp2_sub Expm1 Expm1_sub Log10 Log1p Log1p_sub Log2 Log2_sub Powm1 Powm1_sub Sinh Sinpi Sinpi_sub Sqrt1pm1 Sqrt1pm1_sub Tanh

Atan2() Function Atan2 ( Y As  Double, X As  Double, Optional Info As  Long  ) arctan2(y, x) Purpose Computes the principal value of the arc tangent of y/x in radians. It is the angle from the coordinate origin to a point (x, y) as measured from the positive x-axis. When x > 0, arctan2(y, x) equals to arctan(y/x). When x = 0, it is π/2 if y > 0 and -π/2 if y < 0. Returns Double arctan2(y, x). (-π <= arctan2(y, x) <= π) Parameters [in] Y Argument y. (x <> 0 or y <> 0) [in] X Argument x. (x <> 0 or y <> 0) [out] Info (Optional) = 0: Successful exit. = -1: The argument X or Y had an illegal value. (X = 0 and Y = 0) (returns 0)