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2a^2 (a-a (a^n-1)/(a^n+1))^(2/n)-(a+a (a^n-1)/(a^n+1))^(2/n)-a(a^2-(a (a^n-1)/(a^n+1))^2 )^(1/n)
2a^2 (a-a (a^n-1)/(a^n+1))^(2/n)-(a+a (a^n-1)/(a^n+1))^(2/n)-a(a^2-(a (a^n-1)/(a^n+1))^2 )^(1/n)
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