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If A=[(a,b),(b,a)] and A^2=[(alpha, beta...

If `A=[(a,b),(b,a)] and A^2=[(alpha, beta),(beta, alpha)]` then (A) `alpha=a^2+b^2, beta=ab` (B) `alpha=a^2+b^2, beta=2ab` (C) `alpha=a^2+b^2, beta=a^2-b^2` (D) `alpha=2ab, beta=a^2+b^2`

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