Ononot — What is the directional derivative of f(x, y) = x^2 + y^2 at

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Multivariable & Vectormedium

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What is the directional derivative of $f(x, y) = x^2 + y^2$ at the point $(1, 2)$ in the direction of the vector $\mathbf{v} = \langle 3, 4 \rangle$ ?