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96年 - 96 台灣聯合大學系統(清、交、陽、中四校聯招)學士班轉學生聯合招生試題：微積分#113217
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2. In what direction is the derivative of f(x, y) =
at P(1,1) equal to zero?
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at P(1,1) equal to zero? 
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at P(1,1) equal to zero?