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The magnitude of the directional derivative of the function f(x y)...

This question belongs to Engineering Maths Calculus
Calculus
?

The magnitude of the directional derivative of the function f(x, y) = x2 + 3y2 in a direction normal to the circle x2 + y2 = 2, at the point (1, 1), is

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Correct Answer: Option A
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