TANH(3)

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) cosh(3) sinh(3)