code: public static DoubleBinding tanh(final ObservableDoubleValue x) {
          return createDoubleBinding(() -> Math.tanh(x.get()), x);
      }
docs: Binding for {@link java.lang.Math#tanh(double)}
  
  @param   x The number whose hyperbolic tangent is to be returned.
  @return  The hyperbolic tangent of {@code x}.