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