15 Chapter 1, section 1.2. Riccati Equation. subsection 1.2.7-2. Equations containing arccosine.

 15.1 problem 10
 15.2 problem 11
 15.3 problem 12
 15.4 problem 13
 15.5 problem 14
 15.6 problem 15
 15.7 problem 16
 15.8 problem 17
 15.9 problem 18