If [(a,b),(c,-a)] is a square root of th...

If `[(a,b),(c,-a)]` is a square root of the `2xx2` identity matrix then a,b,c satisfy the relation (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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