Chapter 3. Second order linear equations. Section 22. Higher Order Linear Equations. Coupled Harmonic Oscillators. Problems at page 160

78.15.1 problem 1
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78.15.16 problem 19 (a)
78.15.17 problem 19 (b)
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78.15.20 problem 22 (a)
78.15.21 problem 22 (b)
78.15.22 problem 22 (c)
78.15.23 problem 23