76.12 Chapter 4. Second order linear equations. Section 4.2 (Theory of second order linear homogeneous equations). Problems at page 226

76.12.1 problem 1
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76.12.9 problem 15
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76.12.11 problem 22
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76.12.14 problem 25
76.12.15 problem 26
76.12.16 problem 28
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76.12.26 problem 38