85.75 Chapter 7. Solution of differential equations by use of series. A Exercises at page 329

85.75.1 problem 1 (a)
85.75.2 problem 1 (b)
85.75.3 problem 1 (c)
85.75.4 problem 1 (d)
85.75.5 problem 1 (e)
85.75.6 problem 1 (f)
85.75.7 problem 1 (g)
85.75.8 problem 1 (h)
85.75.9 problem 1 (i)
85.75.10 problem 1 (j)
85.75.11 problem 1 (k)
85.75.12 problem 1 (L)
85.75.13 problem 3