78.14 Chapter 3. Second order linear equations. Section 19. The Method of Variation of Parameters. Problems at page 135

78.14.1 problem 1
78.14.2 problem 2
78.14.3 problem 3 (a)
78.14.4 problem 3 (b)
78.14.5 problem 3 (c)
78.14.6 problem 3 (d)
78.14.7 problem 3 (e)
78.14.8 problem 3 (f)
78.14.9 problem 4 (a)
78.14.10 problem 4 (b)
78.14.11 problem 4 (c)
78.14.12 problem 4 (d)
78.14.13 problem 4 (e)
78.14.14 problem 4 (f)
78.14.15 problem 4 (g)
78.14.16 problem 6 (a)
78.14.17 problem 6 (b)
78.14.18 problem 6 (c)
78.14.19 problem 6 (d)
78.14.20 problem 6 (e)