10 Section 2.4, The method of variation of parameters. Page 154

  10.1 problem 1
  10.2 problem 2
  10.3 problem 3
  10.4 problem 4
  10.5 problem 5
  10.6 problem 6
  10.7 problem 7
  10.8 problem 8
  10.9 problem 11
  10.10 problem 12