Question: Let f be a function of two variables that has continuouspartial derivatives and consider the points As1,3d, Bs3,3d,Cs1,7d, and Ds6,15d. The directional derivative of f

Let f be a function of two variables that has continuouspartial derivatives and consider the points As1,3d, Bs3,3d,Cs1,7d, and Ds6,15d. The directional derivative of f at A inthe direction of the vector AB lis 3 and the directional derivativeat A in the direction of AC lis 26. Find the directionalderivative of f at A in the direction of the vector AD l.

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