1CATANH(3)                  Linux Programmer's Manual                 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 arc hyperbolic tangent of
19       z.  If y = catanh(z), then z = ctanh(y).  The imaginary part  of  y  is
20       chosen in the interval [-pi/2,pi/2].
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22       One has:
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24           catanh(z) = 0.5 * clog((1 + z) / (1 - z))
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VERSIONS

27       These functions first appeared in glibc in version 2.1.
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CONFORMING TO

30       C99.
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SEE ALSO

33       atanh(3), cabs(3), cimag(3), complex(7)
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COLOPHON

36       This  page  is  part of release 3.22 of the Linux man-pages project.  A
37       description of the project, and information about reporting  bugs,  can
38       be found at http://www.kernel.org/doc/man-pages/.
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42                                  2008-08-11                         CATANH(3)
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