20.
(a)
Solve Yn+2 - 2yn-1 + y = n2 - 2"
.
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Yn + 2 - 2yn - 1 + y = n2 - 2
Y(2-2) + 2 - 2y(2-2) - 1 + y
0 + 2 - 0 - 1 + y
2 - 1 +y
1 + y
y = -1
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