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a(n+1)=-3a(n)+a(n-1),
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Éèf(x)=a1+a2*x+a3*x^2+......
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=a1+(a2-3a1)x+(a1-3a2+a3)x^2+......
=a1+(a2-3a1)x
=1.
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f(x)=1/(1-3x+x^2).
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