2. Using y[−1] = 1 and y[−2] = 1, solve y[n + 2] + 2y[n + 1] + y[n]=0.
3. Using y[−1] = 1 and y[−2] = 0, solve y[n + 2] − 2y[n + 1] + 2y[n]=0.
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