題組內容
4. Let 
and C be the level curve of f(x, y)at the level f(x,y) =2.
(b) (7%) Find the equation the tangent line at the point
on level curve C.
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4. Let and C be the level curve of f(x, y)at the level f(x,y) =2.
(b) (7%) Find the equation the tangent line at the point on level curve C.