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If Deltan=|{:(a^2+n," "ab," "ac),(" "ab,...

If `Delta_n=|{:(a^2+n," "ab," "ac),(" "ab,b^2+n," "bc),(" "ac," "bc,c^2+n):}|` where `ninN`, then prove that `(Delta_(2n)^2)/(Delta_n)gt 64 n^3`

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