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