NAME
    IEEEDPTanh -- compute the hyperbolic tangent of a floating point number

SYNOPSIS
      x   = IEEEDPTanh(  y  );
    d0/d1              d0/d1

    double  x,y;

FUNCTION
    Compute hyperbolic tangent of y in IEEE double precision

INPUTS
    y - IEEE double precision floating point value

RESULT
    x - IEEE double precision floating point value

BUGS

SEE ALSO
    ieeedpsinh(), ieeedpcosh()