Let f(x, y) = x^2 + y^2. Determine the directional derivative of f at the point (1, 2) in the direction of the vector v = (3, 4).
Df(1, 2)[v] = 5
Df(1, 2)[v] = 25
Df(1, 2)[v] = 13
Df(1, 2)[v] = 10

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