Let $f ( x , y , z ) = x ^ { 2 } + y ^ { 2 } + x z$ . Find the directional derivative of $f$ at $( 1,2,0 )$ in the direction of the vector $\mathbf { v } = \{ 1 , - 1,1 \}$ .

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The Answer of Let $f ( x , y , z ) = x ^ { 2 } + y ^ { 2 } + x z$ . Find the directional derivative of $f$ at $( 1,2,0 )$ in the direction of the vector $\mathbf { v } = \{ 1 , - 1,1 \}$ .

Let f(x,y,z)=x2+y2+xzf ( x , y , z ) = x ^ { 2 } + y ^ { 2 } + x zf(x,y,z)=x2+y2+xz

Let $f ( x , y , z ) = x ^ { 2 } + y ^ { 2 } + x z$