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

Acos() Function Acos ( X As  Double, Optional Info As  Long  ) arccos(x) Purpose Computes the principal value of the arc cosine of x in radians. Returns Double arccos(x). (0 <= arccos(x) <= π) Parameters [in] X Argument x. (-1 <= X <= 1) [out] Info (Optional) = 0: Successful exit. = -1: The argument X had an illegal value. (X < -1, X > 1)