So times the denominator, I have to do the same thing, one plus cosine of x. I'm not changing the value of the expression. This is just multiplying it by one. But what does that do for us? Well, I can rewrite the whole thing as the limit as x approaches zero. So one minus cosine of x times one plus cosine of x. Well, that is just going to be, let me do this in another color. That is going to be one squared, which is just one, minus cosine squared of x. Cosine squared of x, difference of squares.