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  4. 8.Find the gradient  ∇f(x,y,z) for the function..

研究所、轉學考(插大)-微積分題庫

【非選題】

8.Find the gradient  ∇f(x,y,z) for the function given by f(x,y,z) = y2 + z2 - 4x, and also find the maximum value of the directional derivatives of f(x,y,z) at the point (1,2,-1).