12 Chapter 2. Second-Order Linear Equations. Section 2.4. THE USE OF A KNOWN SOLUTION TO FIND ANOTHER. Page 74

  12.1 problem 1(a)
  12.2 problem 1(b)
  12.3 problem 2
  12.4 problem 3
  12.5 problem 4
  12.6 problem 5
  12.7 problem 6(a)
  12.8 problem 6(b)
  12.9 problem 6(c)
  12.10 problem 7
  12.11 problem 8