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y ′′ + y 0
y ′′ + 2y ′ + y 0
y ′′ − a 2 y 0
y ′′ − 6y ′ + 13y 0 y e 3x cos 2x
y ′′ + 4y ′ − y 0
x 2 y ′′ + xy′ + y 0
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