4. Let f(x,y) = x2+ 4xy + y2. We call the region ｛(x,y)| x2 + y2 ＜1｝open disk D1, [(x,y)| x2+ y2 ≤1｝ the closed disk D2, and｛(x,y)| x2 + y2 =1｝the circle C.
申論題內容
(1)On the open disk D1 find, if there is any, those points on which f(x, y) is a relative minimum, relative maximum or a saddle point.
阿摩線上測驗
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