1CACOSH(3)                    complex math routines                   CACOSH(3)
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NAME

6       cacosh, cacoshf, cacoshl - complex arc hyperbolic cosine
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SYNOPSIS

9       #include <complex.h>
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11       double complex cacosh(double complex z);
12       float complex cacoshf(float complex z);
13       long double complex cacoshl(long double complex z);
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15       Link with -lm.
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DESCRIPTION

18       The   cacosh()  function  calculates  the  complex  acosh().   If  y  =
19       cacosh(z), then z = ccosh(y).  The imaginary part of y is chosen in the
20       interval [-pi,pi].  The real part of y is chosen nonnegative.
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22       One has cacosh(z) = (0.5)*clog((1+z)/(1-z)).
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CONFORMING TO

25       C99
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SEE ALSO

28       acosh(3), cabs(3), cimag(3), complex(7)
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32                                  2002-07-28                         CACOSH(3)
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