[微積] 一題極大值問題
Let f(x)=ax^2/2 with a>0,
and set g(y)=sup [xy-f(x)], y€(-00 ,00)
-00<x<00
find g(y) 請問大家該怎麼求呢
是用一階的微分判斷就好了嗎?
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