cacosh man page on Oracle

```CACOSH(3)		   Linux Programmer's Manual		     CACOSH(3)

NAME
cacosh, cacoshf, cacoshl - complex arc hyperbolic cosine

SYNOPSIS
#include <complex.h>

double complex cacosh(double complex z);
float complex cacoshf(float complex z);
long double complex cacoshl(long double complex z);

DESCRIPTION
The  cacosh()  function calculates the complex arc hyperpolic cosine of
z.  If y = cacosh(z), then z = ccosh(y).	 The imaginary part  of	 y  is
chosen in the interval [-pi,pi].	 The real part of y is chosen nonnega‐
tive.

One has:

cacosh(z) = 2 * clog(csqrt((z + 1) / 2) + csqrt((z - 1) / 2))

VERSIONS
These functions first appeared in glibc in version 2.1.

CONFORMING TO
C99.

EXAMPLE

#include <complex.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>

int
main(int argc, char *argv[])
{
double complex z, c, f;

if (argc != 3) {
fprintf(stderr, "Usage: %s <real> <imag>\n", argv[0]);
exit(EXIT_FAILURE);
}

z = atof(argv[1]) + atof(argv[2]) * I;

c = cacosh(z);
printf("cacosh() = %6.3f %6.3f*i\n", creal(c), cimag(c));

f = 2 * clog(csqrt((z + 1)/2) + csqrt((z - 1)/2));
printf("formula  = %6.3f %6.3f*i\n", creal(f2), cimag(f2));

exit(EXIT_SUCCESS);
}

acosh(3), cabs(3), ccosh(3), cimag(3), complex(7)

COLOPHON
This page is part of release 3.53 of the Linux  man-pages  project.   A
description  of	the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.

2011-09-15			     CACOSH(3)
```
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