And then let me get a little bit closer. And let's get X a little bit closer, and then let's find this slope. And then let's get X even closer than that and find this slope. And in all of those cases, it would be zero. The slope is zero. So one way to think about it, the derivative, or this limit as we approach from the left, seems to be approaching zero. But what about if we were to take Xs to the right?