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TANH(3)                    Linux Programmer's Manual                   TANH(3)
NAME
       tanh, tanhf, tanhl - hyperbolic tangent function
SYNOPSIS
       #include <math.h>
       double tanh(double x);
       float tanhf(float x);
       long double tanhl(long double x);
       Link with -lm.
   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
       tanhf(), tanhl():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
       These  functions  return  the hyperbolic tangent of x, which is defined
       mathematically as:
           tanh(x) = sinh(x) / cosh(x)
RETURN VALUE
       On success, these functions return the hyperbolic tangent of x.
       If x is a NaN, a NaN is returned.
       If x is +0 (-0), +0 (-0) is returned.
       If x is positive infinity (negative infinity), +1 (-1) is returned.
ERRORS
       No errors occur.
ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).
       +-------------------------+---------------+---------+
       |Interface                | Attribute     | Value   |
       +-------------------------+---------------+---------+
       |tanh(), tanhf(), tanhl() | Thread safety | MT-Safe |
       +-------------------------+---------------+---------+
CONFORMING TO
       C99, POSIX.1-2001, POSIX.1-2008.
       The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSO
       acosh(3), asinh(3), atanh(3), cosh(3), ctanh(3), sinh(3)
COLOPHON
       This  page  is  part of release 4.15 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.
                                  2017-09-15                           TANH(3)