2 * ====================================================
3 * Copyright (C) 1998 by Cygnus Solutions. All rights reserved.
5 * Permission to use, copy, modify, and distribute this
6 * software is freely granted, provided that this notice
8 * ====================================================
12 Fast version of tan using Intel float instructions.
14 double _f_tan (double x);
16 Function calculates the tangent of x.
17 There is no error checking or setting of errno.