Re: [多變] 極值
※ 引述《gs86137 (小飛魚)》之銘言：
: Determine the relative extrema and saddle points of
: f(x,y) = x^3 + y^3 + 3xy - 2
我先偏微後變成
fx(x,y) = 3x^2 + 3y
fy(x,y) = 3y^2 + 3x
→ x^2 + y = 0 , y^2 + x = 0
判別式 D(x,y) = fxx‧fyy - (fxy)^2
→ D(x,y) = 36xy - 9
接下來找點要怎麼找呢??
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