14.10 Chapter 2. Second order differential equations. Section 2.4. The method of variation of parameters. Excercises page 156

14.10.1 problem 1
14.10.2 problem 2
14.10.3 problem 3
14.10.4 problem 4
14.10.5 problem 5
14.10.6 problem 6
14.10.7 problem 7
14.10.8 problem 8
14.10.9 problem 9
14.10.10 problem 10
14.10.11 problem 12