2 Chapter 15, Higher order ordinary differential equations. 15.4 Exercises, page 523

  2.1 problem Problem 15.1
  2.2 problem Problem 15.2(a)
  2.3 problem Problem 15.2(b)
  2.4 problem Problem 15.4
  2.5 problem Problem 15.5(a)
  2.6 problem Problem 15.5(b)
  2.7 problem Problem 15.7
  2.8 problem Problem 15.9(a)
  2.9 problem Problem 15.9(b)
  2.10 problem Problem 15.21
  2.11 problem Problem 15.22
  2.12 problem Problem 15.23
  2.13 problem Problem 15.24(a)
  2.14 problem Problem 15.24(b)
  2.15 problem Problem 15.33
  2.16 problem Problem 15.34
  2.17 problem Problem 15.35