5 Chapter 8, Ordinary differential equations. Section 5. SECOND-ORDER LINEAR EQUATIONSWITH CONSTANT COEFFICIENTS AND ZERO RIGHT-HAND SIDE. page 414

  5.1 problem 1
  5.2 problem 2
  5.3 problem 3
  5.4 problem 4
  5.5 problem 5
  5.6 problem 6
  5.7 problem 7
  5.8 problem 8
  5.9 problem 9
  5.10 problem 12
  5.11 problem 19
  5.12 problem 20
  5.13 problem 24
  5.14 problem 25
  5.15 problem 26
  5.16 problem 28