68.12 Chapter 4. Higher Order Equations. Exercises 4.4, page 163

68.12.1 problem 1
68.12.2 problem 2
68.12.3 problem 3
68.12.4 problem 4
68.12.5 problem 5
68.12.6 problem 6
68.12.7 problem 7
68.12.8 problem 8
68.12.9 problem 9
68.12.10 problem 10
68.12.11 problem 11
68.12.12 problem 12
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68.12.15 problem 15
68.12.16 problem 16
68.12.17 problem 17
68.12.18 problem 18
68.12.19 problem 19
68.12.20 problem 20
68.12.21 problem 21
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68.12.25 problem 25
68.12.26 problem 26
68.12.27 problem 27
68.12.28 problem 28
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68.12.30 problem 30
68.12.31 problem 31
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68.12.33 problem 33
68.12.34 problem 34
68.12.35 problem 35
68.12.36 problem 36
68.12.37 problem 37
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68.12.42 problem 42
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68.12.46 problem 46
68.12.47 problem 55
68.12.48 problem 56
68.12.49 problem 57
68.12.50 problem 58 (a)
68.12.51 problem 60
68.12.52 problem 61
68.12.53 problem 61 (a)
68.12.54 problem 62
68.12.55 problem 62 (a)
68.12.56 problem 63
68.12.57 problem 63 (c)
68.12.58 problem 64
68.12.59 problem 65