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

Sqrt1pm1_sub() Sub Sqrt1pm1_sub ( Ret As  Double, X As  Double, Optional Info As  Long  ) sqrt(1 + x) - 1 (Subroutine version) Purpose Evaluates sqrt(1 + x) - 1 accurately in the sense of relative error when x is very small. Parameters [out] Ret sqrt(1 + x) - 1. [in] X Argument x. (X >= -1) [out] Info (Optional) = 0: Successful exit. = -1: The argument X had an illegal value. (X < -1) = 1: Floating point range error. Reference boost/math/special_functions