(a) Find all second partial derivatives of f(x, y) = e² + tan(x + y?) (b) Find and classify the critical points of the function f(x, y) = -2a – 4.xy + 2y? + 2x – 2. (c) Use the chain rule to find the derivative of the function z = 2x*y³ – ry? along the curve given by x = cos 20, y = sin 0. Give your answer in terms of 0.

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