Let $f ( x , y , z ) = x ^ { 3 } + 3 x z + 4 y z + z ^ { 2 }$ .Find , where $\vec { v }$ is a unit vector in the direction of $- \vec { i } + \vec { j } - \vec { k }$ .

Question

Let $f ( x , y , z ) = x ^ { 3 } + 3 x z + 4 y z + z ^ { 2 }$ .Find  , where $\vec { v }$ is a unit vector in the direction of $- \vec { i } + \vec { j } - \vec { k }$ .

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The Answer of Let $f ( x , y , z ) = x ^ { 3 } + 3 x z + 4 y z + z ^ { 2 }$ .Find  , where $\vec { v }$ is a unit vector in the direction of $- \vec { i } + \vec { j } - \vec { k }$ .

Let f(x,y,z)=x3+3xz+4yz+z2f ( x , y , z ) = x ^ { 3 } + 3 x z + 4 y z + z ^ { 2 }f(x,y,z)=x3+3xz+4yz+z2

Let $f ( x , y , z ) = x ^ { 3 } + 3 x z + 4 y z + z ^ { 2 }$