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Let ab=1,Delta=|{:(1+a^2-b^2, 2ab,-2b),(...

Let `ab=1,Delta=|{:(1+a^2-b^2, 2ab,-2b),(2ab,1-a^2+b^2, 2a),(2b,-2a,1-a^2-b^2):}|` then the minimum value of `Delta` is :

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