Sine squared of x times sine of x is sine of x to the third power. And then, let's see, three, so plus three, x to the fourth times x squared is x to the sixth power, and then I have sine squared of x, sine squared of x, cosine of x. So there you have it. That's one strategy, chain rule first and then product rule. What would be another strategy? Pause the video and try to think of it. Well, we could just algebraically use our exponent properties first, in which case, this is going to be equal to the derivative with respect to x of, if I'm taking x squared times sine of x to the third power, instead I could say x to the third to the third power, which is going to be x to the sixth, and then sine of x to the third power, sine of x to the third power.