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

50.12.1 problem 1(a)
50.12.2 problem 1(b)
50.12.3 problem 2
50.12.4 problem 3
50.12.5 problem 4
50.12.6 problem 5
50.12.7 problem 6(a)
50.12.8 problem 6(b)
50.12.9 problem 6(c)
50.12.10 problem 7
50.12.11 problem 8