So that's going to be, let me write this in a different color, maybe an orange. So that's going to be 3 times our something squared times the derivative of that something with respect to t times dh, let me, I've already used that pink, times dh dt. Let's just be very clear. This orange term right over here, and I'm just using the chain rule. This is the derivative of h of t to the third power with respect to h of t. And then we're going to multiply that times the derivative of h of t with respect to t. And then that gives us the derivative of this entire thing, h of t to the third power, with respect to t. This will give us the derivative of h of t to the third power with respect to t, which is exactly what we want to do when we apply this operator. How fast is this changing? How is this changing with respect to time?