題組內容
2. Let f(x,y) = 1 + x² + y².
(a) (6%) Find the points (x,y), if any, at which ∇f(x,y) = 0.
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2. Let f(x,y) = 1 + x² + y².
(a) (6%) Find the points (x,y), if any, at which ∇f(x,y) = 0.