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

6       catanh, catanhf, catanhl - complex arc tangents hyperbolic
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SYNOPSIS

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

18       The   catanh()  function  calculates  the  complex  atanh().   If  y  =
19       catanh(z), then z = ctanh(y).  The imaginary part of y is chosen in the
20       interval [-pi/2,pi/2].
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22       One has catanh(z) = 0.5*clog((1+z)/(1-z)).
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CONFORMING TO

25       C99
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SEE ALSO

28       atanh(3), cabs(3), cimag(3), complex(7)
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32                                  2002-07-28                         CATANH(3)