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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)
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