1 // Copyright (c) 1998-1999 Matra Datavision
2 // Copyright (c) 1999-2012 OPEN CASCADE SAS
4 // The content of this file is subject to the Open CASCADE Technology Public
5 // License Version 6.5 (the "License"). You may not use the content of this file
6 // except in compliance with the License. Please obtain a copy of the License
7 // at http://www.opencascade.org and read it completely before using this file.
9 // The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
10 // main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
12 // The Original Code and all software distributed under the License is
13 // distributed on an "AS IS" basis, without warranty of any kind, and the
14 // Initial Developer hereby disclaims all such warranties, including without
15 // limitation, any warranties of merchantability, fitness for a particular
16 // purpose or non-infringement. Please see the License for the specific terms
17 // and conditions governing the rights and limitations under the License.
19 // -------------------------------------------------------------------------
20 // Definition des fonctions mathematiques hyperboliques: acosh, asinh, atanh
21 // pour Windows/NT uniquement.
22 // -------------------------------------------------------------------------
25 #include <Standard_math.hxx>
27 #ifndef _Standard_MacroHeaderFile
28 # include <Standard_Macro.hxx>
29 #endif // _Standard_MacroHeaderFile
31 Standard_EXPORT double __cdecl acosh( double X)
34 res = log(X + sqrt(X * X - 1));
37 Standard_EXPORT double __cdecl asinh( double X)
40 // Modified by Sergey KHROMOV - Mon Nov 11 16:27:11 2002 Begin
41 // Correction of the formula to avoid numerical problems.
42 // res = log(X + sqrt(X * X + 1));
44 res = log(X + sqrt(X * X + 1));
46 res = -log(sqrt(X * X + 1) - X);
47 // Modified by Sergey KHROMOV - Mon Nov 11 16:27:13 2002 End
50 Standard_EXPORT double __cdecl atanh( double X)
53 res = log((1 + X) / (1 - X)) / 2;