[多變] 請問一題計算

[flygey (努力達成目標)]

           2
         δ        2       2
Find ----------f( y, xy ,-x ) in terms of partial derivatives
       δyδx
f1,f2,f3,f11,f12....and f33 of the function f.

可以版友幫忙解答 感謝

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