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Given that sum(n=1)^oo 1/n^2=pi^2/6 and...

Given that `sum_(n=1)^oo 1/n^2=pi^2/6 and sum_(n=1)^oo 1/(n^2+8n+16)=pi^2/a-b` where a in `N and b in Q` , then a is equal to

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