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[" If "(y^(3)-2x^(2)y)dx+(2xy^(2)-x^(3))dy=0" ,then the value of "xy sqrt(y^(2)-x^(2))" ,is "],[[" (a) "y^(2)+x," (b) "xy^(2)],[" (c) any constant "," (d) None of these "]]

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