Ononot — Suppose z = f(x,y) is a differentiable function, where both

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Multivariable & Vectoreasy

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Suppose $z = f(x,y)$ is a differentiable function, where both $x$ and $y$ are differentiable functions of a single variable $t$ . Which of the following expressions represents the multivariable chain rule for $\frac{dz}{dt}$ ?