9. Let f be a function defined on the set D = {(x, y) | −1 ≤ x ≤ 1,−1 ≤ y ≤ 1}. If (0,0) and (0,0)

問題詳情

9. Let f be a function defined on the set D = {(x, y) | −1 ≤ x ≤ 1,−1 ≤ y ≤ 1}. If

(0,0) and

(0,0) exist, then f isdifferentiable at (0,0).
(A)O
(B)X
(C)
(D)

參考答案

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