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63551311 | 1 | /* Return cosine of complex double value. |
568035b7 | 2 | Copyright (C) 1997-2013 Free Software Foundation, Inc. |
63551311 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
63551311 UD |
10 | |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
63551311 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
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17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
63551311 UD |
19 | |
20 | #include <complex.h> | |
21 | #include <math.h> | |
22 | ||
23 | __complex__ double | |
24 | __cacos (__complex__ double x) | |
25 | { | |
26 | __complex__ double y; | |
27 | __complex__ double res; | |
28 | ||
29 | y = __casin (x); | |
30 | ||
31 | __real__ res = (double) M_PI_2 - __real__ y; | |
32 | __imag__ res = -__imag__ y; | |
33 | ||
34 | return res; | |
35 | } | |
36 | weak_alias (__cacos, cacos) | |
37 | #ifdef NO_LONG_DOUBLE | |
38 | strong_alias (__cacos, __cacosl) | |
39 | weak_alias (__cacos, cacosl) | |
40 | #endif |