2 5 If the directional derivative value (Duf) of the function f(x,y) = x²-3x4 + 4y at Point (-2,0) in direction of a unit vector (u= Ai +Bj) is & and its value at Point (3+2) in the same direction is 261, find the unit vector (u) then find value of the directional derivative (Duf) in the direction of the unit vector (u) at the point (tl). 5

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