{[a^(2n+1)-6a^(2n)+9a^(2n-1)]/(a^2-9)}/[a^(n+1)+4a^(n)+4a^(n-1)]/(a^2-4).
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{[a^(2n+1)-6a^(2n)+9a^(2n-1)]/(a^2-9)}/[a^(n+1)+4a^(n)+4a^(n-1)]/(a^2-4).
{[a^(2n+1)-6a^(2n)+9a^(2n-1)]/(a^2-9)}/[a^(n+1)+4a^(n)+4a^(n-1)]/(a^2-4).
{[a^(2n+1)-6a^(2n)+9a^(2n-1)]/(a^2-9)}/[a^(n+1)+4a^(n)+4a^(n-1)]/(a^2-4).
是不是漏了一对大括弧
{[a^(2n+1)-6a^(2n)+9a^(2n-1)]/(a^2-9)}/[a^(n+1)+4a^(n)+4a^(n-1)]/(a^2-4)
={a^(2n-1)*(a-3)^2/[(a+3)(a-3)]}/{a^(n-1)*(a+2)^2/[(a+2)(a-2)]}
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