Question: ( 1 ) Find the direction for which the directional derivative of the function f ( x , y , z ) = 3 ztan

(1) Find the direction for which the directional derivative of the function f(x, y, z)=3ztan^-1(y/x) is at a maximum at P =(1,1,3). Find the maximum value of the directional derivative f(1,1,3)

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