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Let L=prod(n=3)^oo (1-4/n^2); M=prod(n=2...

Let `L=prod_(n=3)^oo (1-4/n^2); M=prod_(n=2)^oo ((n^3-1)/(n^3+1))` and `N=prod_(n=1)^oo (1+n^-1)^2/(1+2n^-1),` then find then find the value of `L^-1 +M^-1+N^-1.`

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