Exact Differential Equations

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Exact Differential Equations

Phani Chandra Shekar
Sir ,
You said that if an equation is exact differential then Mdx+Ndy =1 ;
But the equation given ((x^3)+(3xy^2))dx+((3x^2y)+(y^3))dy =0 is also exact but Mdx+Ndy =! 1 .please explain.