38.3 Program 25. Second order differential equations. Test Excercise 25. page 1093

38.3.1 problem 1
38.3.2 problem 2
38.3.3 problem 3
38.3.4 problem 4
38.3.5 problem 5
38.3.6 problem 6
38.3.7 problem 7
38.3.8 problem 8