A = (√2) B = (√(2-√2)) C = (√(2-√(2+√2))) D = (√(2-√(2+√(2+√2)))) E = (√(2-√(2+√(2+√(2+√2))))) F = (√(2+√(2+√(2+√(2+√2)))))
answer is 2 :-)
blackjack
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