56.30 Chapter VIII, Linear differential equations of the second order. Article 53. Change of dependent variable. Page 125

56.30.1 problem Ex 1
56.30.2 problem Ex 2
56.30.3 problem Ex 3
56.30.4 problem Ex 4
56.30.5 problem Ex 5
56.30.6 problem Ex 6
56.30.7 problem Ex 7
56.30.8 problem Ex 8