But we're not done yet. We would then divide by the denominator function squared, v of x squared. So let's actually apply this idea. So let's say that we have f of x is equal to x squared over cosine of x. Well, what could be our u of x and what could be our v of x? Well, our u of x could be our x squared, so that is u of x and u prime of x would be equal to two x. And then this could be our v of x.