Differentiate ((q^(k+1) - 1)/(q^k (q - 1))) + ((2q^k (q - 1))/(q^(k+1) - 1)) with respect to kDifferentiate ((q^(k+1) - 1)/(q^k (q - 1))) + ((2q^k (q - 1))/(q^(k+1) - 1)) with respect to k

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