83.40 Chapter VIII. Linear equations of second order. Excercise VIII (E) at page 140

83.40.1 problem 1
83.40.2 problem 2
83.40.3 problem 3
83.40.4 problem 4
83.40.5 problem 5
83.40.6 problem 6
83.40.7 problem 7
83.40.8 problem 8