19 Chapter 2 (Higher order ODE’s). Section 15.4 Nonhomogeneous linear equations with constant coefficients. The Euler equations. Exercises page 143

19.1 problem 618
19.2 problem 619
19.3 problem 620
19.4 problem 621
19.5 problem 622
19.6 problem 623
19.7 problem 624
19.8 problem 625
19.9 problem 626
19.10 problem 627
19.11 problem 628
19.12 problem 629
19.13 problem 630
19.14 problem 631
19.15 problem 632
19.16 problem 633
19.17 problem 634
19.18 problem 635