And so this just tells us, hey, look, the derivative with respect to x of all of this business, first we have to check that our inner function, which would be analogous to our lowercase f here, is this continuous on the interval from 19 to x? Well, no matter what x is, this is going to be continuous over that interval because this is continuous for all x's. And so we meet this first condition, or our major condition. And so then we could just say, all right, then the derivative of all of this is just going to be this inner function replacing t with x. So we're going to get the cube root. Instead of the cube root of t, you're gonna get the cube root of x. And so we can go back to our original question.