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

2002-07-28 CACOSH(3)