1 /* Complex tangent function for float.
2 Copyright (C) 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include "math_private.h"
29 __ctanf (__complex__
float x
)
31 __complex__
float res
;
33 if (!isfinite (__real__ x
) || !isfinite (__imag__ x
))
35 if (__isinff (__imag__ x
))
37 __real__ res
= __copysignf (0.0, __real__ x
);
38 __imag__ res
= __copysignf (1.0, __imag__ x
);
40 else if (__real__ x
== 0.0)
46 __real__ res
= __nanf ("");
47 __imag__ res
= __nanf ("");
50 if (__isinff (__real__ x
))
51 feraiseexcept (FE_INVALID
);
60 __sincosf (2.0 * __real__ x
, &sin2rx
, &cos2rx
);
62 den
= cos2rx
+ __ieee754_coshf (2.0 * __imag__ x
);
64 __real__ res
= sin2rx
/ den
;
65 __imag__ res
= __ieee754_sinhf (2.0 * __imag__ x
) / den
;
70 weak_alias (__ctanf
, ctanf
)