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-'\" t
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\" and Copyright (C) 2011 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.TH cacos 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-cacos, cacosf, cacosl \- complex arc cosine
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <complex.h>
-.P
-.BI "double complex cacos(double complex " z );
-.BI "float complex cacosf(float complex " z );
-.BI "long double complex cacosl(long double complex " z );
-.fi
-.SH DESCRIPTION
-These functions calculate the complex arc cosine of
-.IR z .
-If \fIy\ =\ cacos(z)\fP, then \fIz\ =\ ccos(y)\fP.
-The real part of
-.I y
-is chosen in the interval [0,pi].
-.P
-One has:
-.P
-.nf
- cacos(z) = \-i * clog(z + i * csqrt(1 \- z * z))
-.fi
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR cacos (),
-.BR cacosf (),
-.BR cacosl ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-C99, POSIX.1-2001.
-.SH EXAMPLES
-.\" SRC BEGIN (cacos.c)
-.EX
-/* Link with "\-lm" */
-\&
-#include <complex.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-\&
-int
-main(int argc, char *argv[])
-{
- double complex z, c, f;
- double complex i = I;
-\&
- if (argc != 3) {
- fprintf(stderr, "Usage: %s <real> <imag>\en", argv[0]);
- exit(EXIT_FAILURE);
- }
-\&
- z = atof(argv[1]) + atof(argv[2]) * I;
-\&
- c = cacos(z);
-\&
- printf("cacos() = %6.3f %6.3f*i\en", creal(c), cimag(c));
-\&
- f = \-i * clog(z + i * csqrt(1 \- z * z));
-\&
- printf("formula = %6.3f %6.3f*i\en", creal(f), cimag(f));
-\&
- exit(EXIT_SUCCESS);
-}
-.EE
-.\" SRC END
-.SH SEE ALSO
-.BR ccos (3),
-.BR clog (3),
-.BR complex (7)