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Find a unit vector in the direction in which f(x, y) = 26 - 2x2 - 2y decreases most rapidly at P(-2, -5), and find

Find a unit vector in the direction in which f(x, y) = 26 - 2x2 - 2y decreases most rapidly at P(-2, -5), and find the rate of change of f at P in that direction. NOTE: Enter the exact answers. u = = 11(9-'Z-)fAll

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