[微積] 多變數函數的可微分性
請問多變數函數怎麼看可不可以微分阿
課本上的定義 ﹒▽z = Fx(x,y)Δx + Fy(x,y)Δy +ε1*Δx + ε2*Δy
in which each of ε1,ε2 ---> 0 when Δx,Δy ---> 0
看不太懂耶 有沒有題目可以輔助一下
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