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If A= [(alpha,beta),(gamma,-alpha)] is s...

If `A= [(alpha,beta),(gamma,-alpha)]` is such that `A^(2)=1`, then

A

`1 + alpha^(2) + beta gamma= 0`

B

`1- alpha^(2) + beta gamma= 0`

C

`1- alpha^(2) - beta gamma= 0`

D

`1 + alpha^(2) - beta gamma= 0`

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