cacoshl

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 double z);

       long double complex cacoshl(long double complex z);


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*i,pi*i].  The real part of y is chosen nonnegative.

       One has cacosh(z) = (0.5)*clog((1+z)/(1-z)).

CONFORMING TO
       C99

SEE ALSO
       cabs(3), cimag(3), acosh(3)



				  2002-07-28			    CACOSH(3)