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