Find the directional derivative of $f ( x , y , z ) = x ^ { 2 } + y ^ { 2 } - z$ at the point $( 1,3,5 )$ in the direction of $\mathbf { a } = 2 \mathbf { i } - \mathbf { j } + 4 \mathbf { k }$

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The Answer of Find the directional derivative of $f ( x , y , z ) = x ^ { 2 } + y ^ { 2 } - z$ at the point $( 1,3,5 )$ in the direction of $\mathbf { a } = 2 \mathbf { i } - \mathbf { j } + 4 \mathbf { k }$

Find the Directional Derivative Of f(x,y,z)=x2+y2−zf ( x , y , z ) = x ^ { 2 } + y ^ { 2 } - zf(x,y,z)=x2+y2−z

Find the Directional Derivative Of $f ( x , y , z ) = x ^ { 2 } + y ^ { 2 } - z$