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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 cacosh 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-cacosh, cacoshf, cacoshl \- complex arc hyperbolic cosine
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <complex.h>
-.P
-.BI "double complex cacosh(double complex " z );
-.BI "float complex cacoshf(float complex " z );
-.BI "long double complex cacoshl(long double complex " z );
-.fi
-.SH DESCRIPTION
-These functions calculate the complex arc hyperbolic cosine of
-.IR z .
-If \fIy\ =\ cacosh(z)\fP, then \fIz\ =\ ccosh(y)\fP.
-The imaginary part of
-.I y
-is chosen in the interval [\-pi,pi].
-The real part of
-.I y
-is chosen nonnegative.
-.P
-One has:
-.P
-.nf
-    cacosh(z) = 2 * clog(csqrt((z + 1) / 2) + csqrt((z \- 1) / 2))
-.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 cacosh (),
-.BR cacoshf (),
-.BR cacoshl ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-glibc 2.1.
-.SH EXAMPLES
-.\" SRC BEGIN (cacosh.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;
-\&
-    if (argc != 3) {
-        fprintf(stderr, "Usage: %s <real> <imag>\en", argv[0]);
-        exit(EXIT_FAILURE);
-    }
-\&
-    z = atof(argv[1]) + atof(argv[2]) * I;
-\&
-    c = cacosh(z);
-    printf("cacosh() = %6.3f %6.3f*i\en", creal(c), cimag(c));
-\&
-    f = 2 * clog(csqrt((z + 1)/2) + csqrt((z \- 1)/2));
-    printf("formula  = %6.3f %6.3f*i\en", creal(f), cimag(f));
-\&
-    exit(EXIT_SUCCESS);
-}
-.EE
-.\" SRC END
-.SH SEE ALSO
-.BR acosh (3),
-.BR cabs (3),
-.BR ccosh (3),
-.BR cimag (3),
-.BR complex (7)