題組內容
7. Define u(x,y) = 
, where x = 2s + t and y = 2t + 1.
(a) (5%) Find 
when (x, y) = (0, 1).
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7. Define u(x,y) = , where x = 2s + t and y = 2t + 1.
(a) (5%) Find when (x, y) = (0, 1).