/*
 *  call-seq:
 *     Math.tanh()    => float
 *  
 *  Computes the hyperbolic tangent of <i>x</i> (expressed in
 *  radians).
 */

static VALUE
math_tanh(VALUE obj, VALUE x)
{
    Need_Float(x);
    return DOUBLE2NUM(tanh(RFLOAT_VALUE(x)));
}