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QUESTION 7 Let z = f(x,y) =15x - 9xy + 25y . Find the following using the formal definition of the partial derivative. oz oz

QUESTION 7

Let z = f(x,y) =15x - 9xy + 25y . Find the following using the formal definition of the partial derivative. oz oz of a. b. C. (-5, -2) d. fv( -4,4) ax ay

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