2.12 Chapter 1, section 1.2. Riccati Equation. subsection 1.2.6-4. Equations with cotangent.

2.12.1 Problem 38
2.12.2 Problem 39
2.12.3 Problem 40
2.12.4 Problem 41
2.12.5 Problem 42
2.12.6 Problem 43
2.12.7 Problem 44
2.12.8 Problem 45
2.12.9 Problem 46