CACOSH(3) complex math routines 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 acosh(). 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)).
CONFORMING TO
C99
SEE ALSOacosh(3), cabs(3), cimag(3), complex(7)
2002-07-28 CACOSH(3)