z²+y² 1. Let f(x, y) = xe Answer the following. (a) Compute the direction derivative of f at the point (1, 2), in the direction of (2, 1). Simplify your answer, but do not round! (b) In which direction is the directional derivative of f maximal at the point (0, 2)? Simplify your answer, but do not round! (c) What is the directional derivative of f at (0, 2) in that direction from part (b)? Simplify your answer, but do not round!

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