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解析: az/ax=yf[1]+2xf[2] a^2z/ax^2 =y(yf[11]+2xf[12])+2f[2]+2x(yf[21]+2xf[22]) =y^2f[11]+4xyf[12]+4x^2f[22]+2f[2] 注:f[ ]表示對方括弧中的下標變數求偏導.此處1代表xy,2代表x^2-y^2.
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