Question: X = 1. Let f (x, y) = x = s-t, and y = 8-t. x+y z (a) Use the chain rule to find

X = 1. Let f (x, y) = x = s-t, and y = 8-t. x+y z (a) Use the chain rule to find You may leave your answer in terms of x, y, s, t. z (a) Use the chain rule to find - at You may leave your answer in terms of x, y, s, t. 2. Find all four second-order partial derivatives of f(x, y) = re at (-2,1).

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