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 non-negative.
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
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