And then in the denominator, I am going to have these, which is just x times one plus cosine of x. Now what is one minus cosine squared of x? Well, this comes straight out of the Pythagorean identity, trig identity. This is the same thing as sine squared of x. So sine squared of x. And so I can rewrite all of this as being equal to the limit as x approaches zero. And let me rewrite this as, instead of sine squared of x, that's the same thing as sine of x times sine of x.