NAME

     tanh - hyperbolic tangent function

SYNOPSIS

     #include <math.h>

     double tanh(double x);

DESCRIPTION

     The tanh() function returns the  hyperbolic  tangent  of  x,
     which is defined mathematically as sinh(x) / cosh(x).

CONFORMING TO

     SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO

     acosh(3), asinh(3), atanh(3),