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The value of the directional derivative of the function phi (x...

This question belongs to Engineering Maths Calculus
Calculus
?

The value of the directional derivative of the function \[\phi \](x, y, z) = xy2 + yz2 + zx2 at the point (2, -1, 1) in the direction of the vector p = i + 2j + 2k is

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Correct Answer: Option A
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