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Given that Vf(4, 7) : 9i j, nd the directiOnal derivative of the function f at the point (4, 7) in the direction of a

Given that Vf(4, 7) : 9i j, nd the directiOnal derivative of the function f at the point (4, 7) in the direction of a = 5 i + 2 j. NOTE: Enter the exact answer. m=l J

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