Now we might be tempted to say, oh, well, let's just cross that out with that, and we would get, we would simplify it and get f of x is equal to one over, and we could distribute this two now, we could say two plus two cosine theta. We could say, well, aren't these the same thing? And we would be almost right, because f of x, this one right over here, this is defined, this right over here is defined when theta is equal to zero, while this one is not defined when theta is equal to zero. When theta is equal to zero, you have a zero in the denominator. And so what we need to do in order for this f of x, or in order for this to be the same thing, we have to say theta cannot be equal to zero. But now let's think about the limit again. Essentially what we want to do is we want to find the limit as theta approaches zero of f of x.