V of x is just cosine of x times cosine of x minus the numerator function, which is just x squared, x squared, times the derivative of the denominator function. The derivative of cosine of x is negative sine x. So negative sine of x. Negative sine of x. All of that over, all of that over, the denominator function squared. So that's cosine of x and I'm going to square it. I could write it, of course, like this.