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Let ( 5 + 2 sqrt(6))^(n) = I + f , wher...

Let `( 5 + 2 sqrt(6))^(n) = I + f ` , where n, ` I in N ` and ` 0 lt f lt 1`, then
the value of ` f^(2) - f + I * f - I ` . Is

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