Which of the following differential equations would require using the method of Frobenius to solve?
1) y'' - 3xy' + 2y = 0; y(0) = 2, y'(0) = 0
2) 2y'' + 8y' + 8y = 0; y(0) = 4, y'(0) = 0
3) x²y'' + xy'