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The directional derivative of the scalar function f(x y z) =...

This question belongs to Engineering Maths Calculus
Calculus
?

The directional derivative of the scalar function f(x, y, z) = x2 + 2y2 + z at the point P = (1, 1, 2) in the direction of the vector \[\overrightarrow {\rm{a}} = 3{\rm{\hat i}} - 4{\rm{\hat j}}\]   is

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Correct Answer: Option B
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