64.7 Chapter 2, Section 2.4. Special integrating factors and transformations. Exercises page 67

64.7.1 problem 1
64.7.2 problem 2
64.7.3 problem 3
64.7.4 problem 4
64.7.5 problem 5
64.7.6 problem 6
64.7.7 problem 7
64.7.8 problem 8
64.7.9 problem 9
64.7.10 problem 10
64.7.11 problem 11
64.7.12 problem 12
64.7.13 problem 13
64.7.14 problem 14