68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/* $OpenBSD: s_cacos.c,v 1.6 2013/07/03 04:46:36 espie Exp $ */
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/*
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* Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* cacos()
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*
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* Complex circular arc cosine
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*
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*
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*
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* SYNOPSIS:
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*
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* double complex cacos();
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* double complex z, w;
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*
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* w = cacos (z);
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*
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*
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*
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* DESCRIPTION:
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*
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*
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* w = arccos z = PI/2 - arcsin z.
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*
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*
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*
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*
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* ACCURACY:
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*
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* Relative error:
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* arithmetic domain # trials peak rms
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* DEC -10,+10 5200 1.6e-15 2.8e-16
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* IEEE -10,+10 30000 1.8e-14 2.2e-15
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*/
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#include <float.h>
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#include <openlibm_complex.h>
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#include <openlibm_math.h>
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#include "math_private.h"
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double complex
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cacos(double complex z)
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{
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double complex w;
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w = casin (z);
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w = (M_PI_2 - creal (w)) - cimag (w) * I;
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return (w);
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}
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#if LDBL_MANT_DIG == DBL_MANT_DIG
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openlibm_strong_reference(cacos, cacosl);
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#endif /* LDBL_MANT_DIG == DBL_MANT_DIG */
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