Identify the exactness of (3x2y+2xy+y3)+(x3+x2+3xy2)y′=0(3x^2y + 2xy + y^3) + (x^3 + x^2 + 3xy^2)y' = 0(3x2y+2xy+y3)+(x3+x2+3xy2)y′=0.
Not exact, but has an integrating factor μ(x)\mu(x)μ(x)
Exact
Not exact, but has an integrating factor μ(y)\mu(y)μ(y)
None of the above