7.12 Chapter 2. Linear Equations of Higher Order. Section 2.6 (Forced oscillations and resonance). Problems at page 171

7.12.1 problem 1
7.12.2 problem 2
7.12.3 problem 3
7.12.4 problem 4
7.12.5 problem 5
7.12.6 problem 7
7.12.7 problem 8
7.12.8 problem 9
7.12.9 problem 10
7.12.10 problem 11
7.12.11 problem 12
7.12.12 problem 13
7.12.13 problem 14
7.12.14 problem 15
7.12.15 problem 16
7.12.16 problem 17
7.12.17 problem 18