code: public static <A extends Number & Comparable<?>> NumberExpression<Double> tanh(Expression<A> num) {
          return Expressions.numberOperation(Double.class, Ops.MathOps.TANH, num);
      }
docs: Create a {@code tanh(num)} expression
  
  <p>Returns the hyperbolic tangent of num radians.</p>
  
  @param num numeric expression
  @return tanh(num)