1. Solve the differential equation y"" +2y" + 5y' = 0. 2. Solve the differential equation y" - y" - 4y = 0. 3. Solve the differential equation y(4) + y"" + 3y" = 0. 4. Solve the differential equation y" - 10y' + 25y = 30x - 3 by undetermined coefficients. 5. Solve the differential equation 4y"-4y'-3y = 2 sin x by undetermined coefficients. 6. Solve the differential equation y"+2y'-3y=2x-ex by undetermined coefficients. 7. Solve the differential equation y" + y = 3+ 4 cos x by undetermined coefficients. 8. Solve the differential equation y(4) 2y + y = x + 1 by undetermined coefficients. 9. Solve the differential equation y" - 4y' + 4y = 2x = I 10. Solve differential equation y" + 3y' + 2y = 1+ex 11. Solve differential equation y" - 2y' + y = ex lnx.