## Question

###### $17-20$ Use a tree diagram to write out the Chain Rule for the given case. Assume all functions are differentiable. $$u=f(x, y), \quad \text { where } x=x(r, s, t), y=y(r, s, t)$$

$17-20$ Use a tree diagram to write out the Chain Rule for the given case. Assume all functions are differentiable. $$u=f(x, y), \quad \text { where } x=x(r, s, t), y=y(r, s, t)$$

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