Given that
what is the maximum rate of change of $f$ at the point $(4, -1)$?
sqrt(148)
f(x, y) = (x^1 + y^1) e^{-1x - 4y},
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Determine the directional derivative of $f(x, y)$ at the point $(4, -1)$ in the direction of $\theta = \frac{4\pi}{3}$ with the positive $x$ axis.
$D_u f(x, y) =$
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Determine the directional derivative of $f(x, y)$ at the point $(4, -1)$ in the direction of the origin from the point $(4, -1)$.
$D_u f(x, y) =$
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