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Find the value of the directional derivative of the function w = f ( x ,...

Find the value of the directional derivative of the function w = f ( x , y , z ) = 2 x y + 3 y z - 4 x z

in the direction of the vector   v = < 1 , -1 , 1 > at the point P ( 1 , 1 , 1 ) .

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