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Find the derivative of the function at Po in the direction of A. f(x,y) = - 5xy + y , Po(10, -4), A= - 10i

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Find the derivative of the function at Po in the direction of A. f(x,y) = - 5xy + y , Po(10, -4), A= - 10i - 3j (DAf) (10, -4) = (Type an exact answer, using radicals as needed.)

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