67.2 Chapter 3. Some basics about First order equations. Additional exercises. page 63

67.2.1 problem 3.4 a
67.2.2 problem 3.4 b
67.2.3 problem 3.4 c
67.2.4 problem 3.4 d
67.2.5 problem 3.4 e
67.2.6 problem 3.4 f
67.2.7 problem 3.4 g
67.2.8 problem 3.4 h
67.2.9 problem 3.4 i
67.2.10 problem 3.4 j
67.2.11 problem 3.6