diff options
Diffstat (limited to 'math/s_cacos.c')
| -rw-r--r-- | math/s_cacos.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/math/s_cacos.c b/math/s_cacos.c new file mode 100644 index 0000000..07b6bdc --- /dev/null +++ b/math/s_cacos.c @@ -0,0 +1,41 @@ +/* Return cosine of complex double value. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <complex.h> +#include <math.h> + +__complex__ double +__cacos (__complex__ double x) +{ + __complex__ double y; + __complex__ double res; + + y = __casin (x); + + __real__ res = (double) M_PI_2 - __real__ y; + __imag__ res = -__imag__ y; + + return res; +} +weak_alias (__cacos, cacos) +#ifdef NO_LONG_DOUBLE +strong_alias (__cacos, __cacosl) +weak_alias (__cacos, cacosl) +#endif |