Find the directional derivative to the given function at the specified point $P$ in the direction of the vector $\vec { u }$ $f ( x , y , z ) = x y z ^ { 2 } , P = ( 1,2,1 ) , \vec { u } = \langle 1 , \sqrt { 3 } , 0 \rangle$

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The Answer of Find the directional derivative to the given function at the specified point $P$ in the direction of the vector $\vec { u }$ $f ( x , y , z ) = x y z ^ { 2 } , P = ( 1,2,1 ) , \vec { u } = \langle 1 , \sqrt { 3 } , 0 \rangle$

Find the Directional Derivative to the Given Function at the Specified