(-sqrt(2))(((1-√2)/(1+√2))^(2^n )+1)/(((1-√2)/(1+√2))^(2^n )-1) where n=2(-sqrt(2))(((1-√2)/(1+√2))^(2^n )+1)/(((1-√2)/(1+√2))^(2^n )-1) where n=2

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