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Find the directional derivative of the function at the given point, in the vector direction v...

Find the directional derivative of the function at the given point, in the
vector direction v

1- f(x, y) = ln(x^2 + y^2 ), (2, I), v = ( - 1, 2)

2- g(r, 0) = e^-r sin ø, (0, ∏/ 3), v = 3 i - 2 j

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