#### Answer

Where $y=f(x)$ and $u=g(x)$, the two ways to write the derivative of $y=f(g(x))$ is:
1. $\frac{dy}{dx} = \frac{dy}{du} \times \frac{du}{dx}$
2. $\frac{d}{dx}[f(g(x))] = f'(g(x)) \times g'(x)$

#### Work Step by Step

According to Theorem 3.14, where $y=f(x)$ and $u=g(x)$, the two ways to write the derivative of $y=f(g(x))$ is:
1. $\frac{dy}{dx} = \frac{dy}{du} \times \frac{du}{dx}$
2. $\frac{d}{dx}[f(g(x))] = f'(g(x)) \times g'(x)$