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); Link with -lm.
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 nonnegative.
- One has:
- cacosh(z) = (0.5) * clog((1 + z) / (1 - z))
VERSIONS
These functions first appeared in glibc in version 2.1.
CONFORMING TO
C99.
SEE ALSO
acosh(3), cabs(3), cimag(3), complex(7)
COLOPHON
- This page is part of release 3.25 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/.