2.2 section 2. Solution found using all possible Kovacic cases

2.2.1 problem 1
2.2.2 problem 2
2.2.3 problem 3
2.2.4 problem 4
2.2.5 problem 5
2.2.6 problem 6
2.2.7 problem 7
2.2.8 problem 8
2.2.9 problem 9