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GATE Electrical 2018 | Question: 12

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The value of the directional derivative of the function $\Phi (x,y,z) = xy^2 +yz^2+zx^2$ at the point $(2,-1,1)$ in the direction of the vector $\textbf{p}= \textbf{i} +2 \textbf{j} + 2 \textbf{k}$ is

  1. $1$
  2. $0.95$
  3. $0.93$
  4. $0.9$

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