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What does the General Power Rule  for differentiation state?
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General Power Rule a special case of the Chain Rule.

If $y=[u(x)]^{n}$, where $u$ is a differentiable function of $x$ and $n$ is a rational number, then
$$\frac{d y}{d x}=n[u(x)]^{n-1} \frac{d u}{d x} \text { or equivalently, } \frac{d}{d x}\left[u^{n}\right]=n u^{n-1} u^{\prime}$$
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