Let's look at another case. Let's look at a case where we have what's sometimes called a removable discontinuity or a point discontinuity. So once again, let's say we're approaching from the left. This is X, this is the point X comma F of X. Now what's interesting is, where as this expression is the slope of the line connecting X comma F of X and C comma F of C, which is this point, not that point. Remember, we have this removable discontinuity right over here. And so this would be, this expression is calculating the slope of that line.