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Mathematics, 25.06.2020 02:01 cutie777

Let f be a function of two variables that has continuous partial derivatives and consider the points A(6, 4), B(7, 4), C(6, 10), and D(18, 13). The directional derivative of f at A in the direction of the vector AB is 5 and the directional derivative at A in the direction of AC is 5. Find the directional derivative of f at A in the direction of the vector AD. (Round your answer to two decimal places.)

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