14.9 Chapter 2. Second order differential equations. Section 2.2.2. Equal roots, reduction of order. Excercises page 149

14.9.1 problem 1
14.9.2 problem 2
14.9.3 problem 3
14.9.4 problem 4
14.9.5 problem 6
14.9.6 problem 7
14.9.7 problem 10
14.9.8 problem 11
14.9.9 problem 12
14.9.10 problem 13
14.9.11 problem 14
14.9.12 problem 15
14.9.13 problem 16
14.9.14 problem 17
14.9.15 problem 19
14.9.16 problem 20