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∏n=2∞n3−1n3+1\large \displaystyle \prod_{n=2}^{\infty} \dfrac {n^3-1}{n^3 + 1}n=2∏∞n3+1n3−1
If the value of the above expression can be expressed as ab \dfrac abba, where aaa and bbb are coprime positive integers, find a+ba+ba+b.
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