顺便写下解题过程

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顺便写下解题过程
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顺便写下解题过程

顺便写下解题过程

顺便写下解题过程

lnz=xyln(x^2-y^2)
(1/z)dz=yln(x^2-y^2)dx+xln(x^2-y^2)dy+[xy/(x^2-y^2)](2xdx-2ydy)
dz=z{[yln(x^2-y^2)+2x^2y/(x^2-y^2)]dx+[xln(x^2-y^2)-2xy^2/(x^2-y^2)]dy}