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Question: problem 17 if denotes a unit vector in the...

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Problem (17) If à denotes a unit vector in the plane, let Da denote the usual directional derivative in the direction of a. Explicitly, if we write à (a1, a2) and K(x,y) is a two variable function then Da K-a1K® + a2Ky-а . ) u + iv be ạn ạnalytic function at z. Show that Du Dêu where c is the unit vector rotated 90° from a. KI Now let f(z 2)-lu + 2u be an ana

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