1.

(i) `(dy)/(dx)+(3xy+y^(2))/(x^(2)+xy)=0` (ii) `(x^(3)-3xy^(2))dx=(y^(3)-3x^(2)y)dy`

Answer» `x^(2)(y^(2)+2xy)=c^(2)` (ii) `x^(2)-y^(2)=c(x^(2)+y^(2))^(2)`


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