- (e^(-2k)(1+k)^2) + sum from t=0 to infinity of (1-1/n)^(2t) (1+t/(n-1))^2 - (e^(-2k)(1+k)^2) + sum from t=0 to infinity of (1-1/n)^(2t) (1+t/(n-1))^2

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