Find the directional derivative of

4.A] Find the directional derivative of \phi = x^2yz + 4xz^2 at (1, -2, -1) in the direction of 2\hat{i} - \hat{j} - 2\hat{k}

Answer:

Find the directional derivative of <span class="wp-katex-eq" data-display="false"> \phi = x^2yz + 4xz^2 </span> at (1, -2, -1) in the direction of <span class="wp-katex-eq" data-display="false"> 2\hat{i} - \hat{j} - 2\hat{k} </span>

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