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. I would take the derivative of the first expression, so x, derivative of x squared is two x, let me write a little bit to the right. This is gonna be two x times the second expression, sine of x, plus the first expression, x squared, times the derivative of the second one, cosine of x. That's just the product rule as applied to this part right over here.