`(x^3)*y - x*(y^3) = 4`
`3(x^2)*y + (x^3)*(dy/dx) - (y^3) - 3x(y^2)*(dy/dx) = 0`
`or, (dy/dx)*[(x^3)-3x(y^2)] = (y^3) - 3(x^2)y`
`or, dy/dx = [(y^3) - 3(x^2)y]/[(x^3)-3x(y^2)]`
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