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Let f be a function of two variables that has continuous partial derivatives and consider the...

Let f be a function of two variables that has continuous partial derivatives and consider the points

A(1, 1),

B(7, 1),

C(1, 13),

D(9, 16).

The directional derivative of f at A in the direction of the vector

AB is 9 and the directional derivative at A in the direction of

AC is 2. 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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