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(7) (7pts each) Let f(x, y) = x2y - x (a) Find Vf at (2,1) CO (b) Write the equation for the tangent plane at

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(7) (7pts each) Let f(x, y) = x2y - x (a) Find Vf at (2,1) CO (b) Write the equation for the tangent plane at (2, 1, 2) (c) Use an appropriate linearization to approximate at (1.9,1.1) (d) Find the directional derivative of f in the direction of -i + 2j

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