題組內容
6.z = f(x,y)=x2y3-4y2
(c) Evaluate Duf(1,2) the directional derivative of f(x,y) at (1,2) in the direction of the unit vector
.(5分)
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(c) Evaluate Duf(1,2) the directional derivative of f(x,y) at (1,2) in the direction of the unit vector.(5分)