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

NAME         top

       cacosh, cacoshf, cacoshl - complex arc hyperbolic cosine

SYNOPSIS         top

       #include <complex.h>

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

       Link with -lm.

DESCRIPTION         top

       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 nonnegative.

       One has:

           cacosh(z) = (0.5) * clog((1 + z) / (1 - z))

VERSIONS         top

       These functions first appeared in glibc in version 2.1.

CONFORMING TO         top

       C99.

SEE ALSO         top

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

COLOPHON         top

       This page is part of release 3.32 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/.

                                      2008-08-11                            CACOSH(3)

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