It's kind of redundant, but I'll rewrite it. f of 1 is undefined. But what if I were to ask you, what is the function approaching as x equals 1? Now, this is starting to touch on the idea of a limit. So as x gets closer and closer to 1, so as we get closer and closer x is to 1, as we get closer and closer x is to 1, what is the function approaching? Well, this entire time, the function, what's it getting closer and closer to? On the left-hand side, no matter how close you get to 1, as long as you're not at 1, you're actually at f of x is equal to 1.