53.2 section 2. Solution found using all possible Kovacic cases

53.2.1 problem 1
53.2.2 problem 2
53.2.3 problem 3
53.2.4 problem 4
53.2.5 problem 5
53.2.6 problem 6
53.2.7 problem 7
53.2.8 problem 8
53.2.9 problem 9