13 Chapter 1, section 1.2. Riccati Equation. subsection 1.2.6-5. Equations containing combinations of trigonometric functions.

13.1 problem 47
13.2 problem 48
13.3 problem 49
13.4 problem 50
13.5 problem 51
13.6 problem 52
13.7 problem 53
13.8 problem 54
13.9 problem 55
13.10 problem 56
13.11 problem 57
13.12 problem 58
13.13 problem 59