Chapter 7. Power series methods. Exercises at page 517

90.30.1 problem 1
90.30.2 problem 2
90.30.3 problem 3
90.30.4 problem 4
90.30.5 problem 5
90.30.6 problem 6
90.30.7 problem 7
90.30.8 problem 8
90.30.9 problem 9
90.30.10 problem 10