So if I take the derivative, it would be the derivative with respect to that something, so that would be three times that something squared times the derivative with respect to x of that something, where the something in this case is x squared sine of x, x squared sine of x. This is just an application of the chain rule. Now, the second part, what would that be? The second part here, this is another color, in orange. Well, here I would apply the product rule. I have the product of two expressions, so I would take the derivative of, let me write this down. So this is gonna be the product rule, product rule.