[微方] 有關拉普拉斯方程
http://imgur.com/a/qFbpw
如圖,題目要我換成 r跟角度表示的方程
但在(二)之後
我偏微出來的結果(紅三)跟詳解的結果(藍一)不太一樣,想請問是不是因為(一)的關係
又從藍一變成藍二又是怎麼得出來的
希望有高人不吝賜教>_<
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