Chapter 4. Higher Order Equations. Exercises 4.9, page 215

68.17.1 problem 1
68.17.2 problem 2
68.17.3 problem 3
68.17.4 problem 4
68.17.5 problem 5
68.17.6 problem 6
68.17.7 problem 7
68.17.8 problem 8
68.17.9 problem 9
68.17.10 problem 10
68.17.11 problem 11
68.17.12 problem 12
68.17.13 problem 13
68.17.14 problem 14
68.17.15 problem 15
68.17.16 problem 16
68.17.17 problem 17
68.17.18 problem 19 (a)
68.17.19 problem 19 (b)
68.17.20 problem 19 (c)
68.17.21 problem 21
68.17.22 problem 22
68.17.23 problem 23
68.17.24 problem 24
68.17.25 problem 27 (a)
68.17.26 problem 27 (b)