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If A = [{:(a,b),(c,-a):}] is such that A...

If `A = [{:(a,b),(c,-a):}]` is such that `A ^(2)=I` then _________.

A

`1- a ^(2) + bc =0`

B

`1 + a ^(2) + bc = 0`

C

`1 + a ^(2) - bc = 0`

D

`1 - a ^(2) - bc =0`

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