72.5 Chapter 2. First order equations. Section 9 (Integrating Factors). Problems at page 80

72.5.1 problem 2 (a)
72.5.2 problem 2 (b)
72.5.3 problem 2 (c)
72.5.4 problem 2 (d)
72.5.5 problem 2 (e)
72.5.6 problem 2 (f)
72.5.7 problem 2 (g)
72.5.8 problem 2 (h)
72.5.9 problem 2 (i)
72.5.10 problem 2 (j)
72.5.11 problem 2 (k)
72.5.12 problem 4 (a)
72.5.13 problem 4 (b)
72.5.14 problem 4 (c)
72.5.15 problem 4 (d)
72.5.16 problem 4 (e)
72.5.17 problem 4 (f)
72.5.18 problem 4 (g)
72.5.19 problem 4 (h)
72.5.20 problem 4 (i)
72.5.21 problem 4 (j)
72.5.22 problem 4 (k)
72.5.23 problem 4 (L)
72.5.24 problem 4 (m)
72.5.25 problem 5