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The directional derivative of f(x, y) = -e cos y at (0, 4) in the direction %3D of v = (-6, 8) is O

The directional derivative of f(x, y) = -e" cos y at (0, 4) in the direction %3D of v = (-6, 8) is O -7 5/2 7 5/2 O -14 5/2 14 5/2

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