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Recurrence Relationsmedium
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A recurrence relation an=c1an−1+c2an−2a_n = c_1 a_{n-1} + c_2 a_{n-2} has roots r=α±βir = \alpha \pm \beta i. Expressing these as ρ(cos⁡θ±isin⁡θ)\rho(\cos \theta \pm i \sin \theta), what is the general solution?