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The directional derivative of f(x y z) = 2x2 + 3y2...

This question belongs to Engineering Maths Calculus
Calculus
?

The directional derivative of f(x, y, z) = 2x2 + 3y2 + z2 at the point P(2, 1, 3) in the direction of the vector a = i - 2k is

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Correct Answer: Option C
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