Question: ( b ) Let f ( x , y , z ) = x 2 + y z . Find the directional derivative of f

(b) Let f(x,y,z)=x2+yz. Find the directional derivative of f at the point (1,-1,1) in the direction of v=i+2j-2k
[10 marks]
( b ) Let f ( x , y , z ) = x 2 + y z . Find the

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