Well, let's see. Three times two is six. X to the fourth times x is x to the fifth. 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.