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3-5-23
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    We need to do the product rule here. So DRD Theta The derivative of the one is 0, but we have Theta 4 and sine Theta. So think of that as -1 times Theta to the 4th. Well, the derivative of Theta to the 4th is going to be 4 Theta cubed by using the power rule times sine Theta plus. And now we're going to do the derivative of the sine to the 4th portion. And the derivative of sine is cosine. So when we simplify this up, we get -4 Theta cubed sine Theta minus Theta, the 4th cosine Theta.