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∑from 1to infinity of n^2* e^-2n
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∑from 1to infinity of n^2* e^-2n

User Seephor
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∑ from 1 to infinity of n^2* e^(-2n) = (e^2 + e^4)/(e^2 - 1)^3 = 0.23768
User Vishesh Handa
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