Find the directional derivative of a given equation at the point in the direction of the vector 3 a] Find the directional derivative of \phi=x^{2}yz+4xz^{2} at the point(1,-2,1) in the direction of the vector 2\widehat{i}-\widehat{j}-2\widehat{k} Find the directional derivative of \phi=x^{2}yz+4xz^{2} at the point(1,-2,1) in the direction of the vector 2\widehat{i}-\widehat{j}-2\widehat{k}
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