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SuSE 11.3 - man page for cacoshf (suse section 3)

CACOSH(3)			    Linux Programmer's Manual				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  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 nonnegative.

       One has:

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

VERSIONS
       These functions first appeared in glibc in version 2.1.

CONFORMING TO
       C99.

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

COLOPHON
       This  page  is  part of release 3.25 of the Linux man-pages project.  A description of the
       project,  and  information  about  reporting  bugs,  can  be  found   at   http://www.ker-
       nel.org/doc/man-pages/.

					    2008-08-11					CACOSH(3)


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