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Find the directional derivative of f at P in the direction of a. f(x, y) = 5tan-1 P(-6,6); a = -51 - 5j NOTE: Enter

Find the directional derivative of f at P in the direction of a. f(x, y) = 5tan-1 P(-6,6); a = -51 - 5j NOTE: Enter the exact answer. Duf =

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