78.13 Chapter 3. Second order linear equations. Section 18. The Method of Undetermined Coefficients. Problems at page 132

78.13.1 problem 1 (a)
78.13.2 problem 1 (b)
78.13.3 problem 1 (c)
78.13.4 problem 1 (d)
78.13.5 problem 1 (e)
78.13.6 problem 1 (f)
78.13.7 problem 1 (g)
78.13.8 problem 1 (h)
78.13.9 problem 1 (i)
78.13.10 problem 1 (j)
78.13.11 problem 1 (k)
78.13.12 problem 2
78.13.13 problem 3 (a)
78.13.14 problem 3 (b)