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If A=[[x,1],[1,0]]and A^2=I, then A^-1 ...

If ` A=[[x,1],[1,0]]`and `A^2=I`, then `A^-1 =`

A

`[[0,1],[1,0]]`

B

`[[1,0],[0,1]]`

C

`[[1,1],[1,1]]`

D

`[[0,0],[0,0]]`

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