23.2 Chapter 3. Linear differential equations of second order. Exercises at page 31

23.2.1 problem 4(a)
23.2.2 problem 4(b)
23.2.3 problem 4(c)
23.2.4 problem 4(d)
23.2.5 problem 4(e)
23.2.6 problem 4(f)
23.2.7 problem 4(g)
23.2.8 problem 4(h)
23.2.9 problem 4(i)
23.2.10 problem 4(j)
23.2.11 problem 5
23.2.12 problem 6(a)
23.2.13 problem 6(b)
23.2.14 problem 6(c)
23.2.15 problem 6(d)
23.2.16 problem 6(e)
23.2.17 problem 6(f)
23.2.18 problem 6(g)
23.2.19 problem 6(h)
23.2.20 problem 6(i)
23.2.21 problem 6(j)
23.2.22 problem 7
23.2.23 problem 8
23.2.24 problem 9