36 Chapter IX, Miscellaneous methods for solving equations of higher order than first. Article 60. Exact equation. Integrating factor. Page 139

36.1 problem Ex 1
36.2 problem Ex 2
36.3 problem Ex 3
36.4 problem Ex 4
36.5 problem Ex 5
36.6 problem Ex 6
36.7 problem Ex 7
36.8 problem Ex 8
36.9 problem Ex 10