84.19 Chapter 12. Second order linear homogeneous differential equations with constant coefficients. Solved problems. Page 64

84.19.1 problem 12.1
84.19.2 problem 12.2
84.19.3 problem 12.3
84.19.4 problem 12.4
84.19.5 problem 12.5
84.19.6 problem 12.6
84.19.7 problem 12.7
84.19.8 problem 12.8