For each differential equation in Problems 1-21, find the general solution by finding the homogeneous solution and a particular solution. 1. y' = 1 2. y' + y = 1 3. y' + y = x 4. y'' = 1 5. y'' + 4y' = 1 6. y'' + 4y = 1 7. y'' + 4y' = x 8. y'' + y' - 2y = 3 - 6x 9. y'' + y = 6e^x + 3 10. y'' - y' - 2y = 6e^x 11. y'' + y' = 6 sin 2x 12. y'' + 4y' + 5y = 2e^x 13. y'' + 3y' = sin x + 2 cos x 14. y'' + 4y' + 4y = xe^-x 15. y'' - y = x sin x 16. y'' - 3y' + 2y = e^x sin x 17. y'' - 4y' + 4y = xe^2x 18. y'' + y = 12 cos^2 x 19. y'' - 4y' + 3y = 20 cos x 20. y'' - y = 8xe^x 21. y'' - 5y' + 6y = cosh x
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