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Let P(n)=a^(P(n-1))-1,AA n=2,3,..., and ...

Let `P_(n)=a^(P_(n-1))-1,AA n=2,3,...,` and let `P_(1)=a^(x)-1,` where `ainR^(+).` Then evaluate `underset(xto0)lim(P_(n))/(x).`

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