3 Chapter 12. VARIATION OF PARAMETERS. page 104

  3.1 problem Problem 12.1
  3.2 problem Problem 12.2
  3.3 problem Problem 12.3
  3.4 problem Problem 12.4
  3.5 problem Problem 12.5
  3.6 problem Problem 12.6
  3.7 problem Problem 12.7
  3.8 problem Problem 12.8