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Find a unit vector in the same direction as (2,4) Given f(x, y) = 4x - 5xy + 2y, find the directional derivative at

Find a unit vector in the same direction as (2,4) Given f(x, y) = 4x - 5xy + 2y, find the directional derivative at (x, y) = (5, 1) in the direction of (2, 4). Round to 5 decimal places as necessary.

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