Let $f(x, y) = x^2 - xy$ and $\vec{\text{v}} = \left[\begin{array}{c} 2 \\ -1 \end{array} \right]$. Compute the directional derivative of $f$ along $\vec{\text{v}}$.
$\nabla_\vec{\text{v}} f(x, y) = $ [[☃ expression 1]]
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