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The directional derivative of the function f(x y) = x2 +...

This question belongs to Engineering Maths Calculus
Calculus
?

The directional derivative of the function f(x, y) = x2 + y2 along a line directed from (0, 0) to (1, 1), evaluated at point x = 1, y = 1 is

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Correct Answer: Option C
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