3. Which of the following differential equations can be solved by utilizing the method of undetermined coefficients? I: y" – ty + 3y = e' II : y") – y = cost – sint et – cost III : 2y" + 2y – 6y t IV...

Extracted text: 3. Which of the following differential equations can be solved by utilizing the method of undetermined coefficients? I: y" – ty + 3y = e' II : y") – y = cost – sint et – cost III : 2y" + 2y – 6y t IV : y" + 3y' – 2y = tant +t A) only II B) I and III C) I and II D) II and IV E)III and IV