14.11 Chapter 8, Linear differential equations of order n. Section 8.9, Reduction of Order. page 572

14.11.1 problem Problem 1
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14.11.3 problem Problem 3
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14.11.5 problem Problem 5
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14.11.7 problem Problem 10
14.11.8 problem Problem 11
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14.11.11 problem Problem 14
14.11.12 problem Problem 15