9 Chapter 4. Higher order linear differential equations. Lesson 22. Variation of Parameters

  9.1 problem Exercise 22.1, page 240
  9.2 problem Exercise 22.2, page 240
  9.3 problem Exercise 22.3, page 240
  9.4 problem Exercise 22.4, page 240
  9.5 problem Exercise 22.5, page 240
  9.6 problem Exercise 22.6, page 240
  9.7 problem Exercise 22.7, page 240
  9.8 problem Exercise 22.8, page 240
  9.9 problem Exercise 22.9, page 240
  9.10 problem Exercise 22.10, page 240
  9.11 problem Exercise 22.11, page 240
  9.12 problem Exercise 22.12, page 240
  9.13 problem Exercise 22.13, page 240
  9.14 problem Exercise 22.14, page 240
  9.15 problem Exercise 22.15, page 240
  9.16 problem Exercise 22, problem 16, page 240
  9.17 problem Exercise 22, problem 17, page 240
  9.18 problem Exercise 22, problem 18, page 240
  9.19 problem Exercise 22, problem 19, page 240
  9.20 problem Exercise 22, problem 20, page 240