68.1 Chapter 1 VARIABLE COEFFICIENT, SECOND ORDER DIFFERENTIAL EQUATIONS. Problems page 28

68.1.1 problem Problem 1.1(a)
68.1.2 problem Problem 1.1(b)
68.1.3 problem Problem 1.3(a)
68.1.4 problem Problem 1.3(b)
68.1.5 problem Problem 1.3(c)
68.1.6 problem Problem 1.3(d)
68.1.7 problem Problem 1.6(a)
68.1.8 problem Problem 1.6(b)
68.1.9 problem Problem 1.7
68.1.10 problem Problem 1.8(a)
68.1.11 problem Problem 1.8(b)
68.1.12 problem Problem 1.9
68.1.13 problem Problem 1.11(a)
68.1.14 problem Problem 1.11(b)
68.1.15 problem Problem 1.12
68.1.16 problem Problem 1.13