1. The problem is to find the derivative $\frac{dy}{dx}$ of a function at the point $(2,4)$. However, the function $y=f(x)$ is not provided, so we cannot directly compute the derivative. 2. To find $\frac{dy}{dx}$ at a point, we need the explicit function $y=f(x)$ or an implicit relation involving $x$ and $y$. 3. If you provide the function or equation relating $x$ and $y$, I can help find $\frac{dy}{dx}$ at $(2,4)$ using differentiation rules. Please provide the function or equation for $y$ in terms of $x$.