CACOSH(3) Linux Programmers Manual CACOSH(3)
NAME
cacosh, cacoshf, cacoshl  complex arc hyperbolic cosine
SYNOPSIS
#include
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 nonneg
ative.
One has:
cacosh(z) = (0.5) * clog((1 + z) / (1  z))
CONFORMING TO
C99.
SEE ALSO
acosh(3), cabs(3), cimag(3), complex(7)
COLOPHON
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20071226 CACOSH(3)
