This thing right over here, as I said, it's not defined for x equals one, but it is defined for anything not, for x does not equal one, and we're just approaching one. And if we wanted to simplify this expression, it would get, this would just be, I think I just did this, but I'm just making sure I'm doing it right. This is going to be the same thing as that for x not being equal to one. Well this is just going to be zero. You could just evaluate when x is equal to one here, this is going to be equal to zero. And so notice, you get a different limit for this definition of derivative as we approach from the left-hand side or the right-hand side. And that makes sense.