Question: ( c ) Given ( x , y , z ) = 9 z y + 3 x 2 + z c o s y

(c) Given (x,y,z)=9zy+3x2+zcosy.
(i) Find the directional derivative of at the point x(1,,0) in the direction of the vector from A(1,2,3) to B(5,6,9)
(ii) Find the direction and the minimum value of the directional derivative at x.
( c ) Given ( x , y , z ) = 9 z y + 3 x 2 + z c o

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