2 xy". - I + 3x'y". 2 →(2(3-t)(45+24)' ((33-t)"( 43+2€)² 6. Find the unit vector for which the directional derivative Duf(x,y) of f(x,y) = 3x2 + 4y2 at the point (-1,1) is minimized. %3D

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