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If A=[i0 0i] , write A^2 ....

If `A=[i0 0i]` , write `A^2` .

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Given: `A=[(i,0),( 0,i)]`
Then
`A^2=A`.`A=[(i,0),( 0,i)][(i,0),( 0,i)]`
`A^2=[(i^2,0),(0,i^2)]`
As we know `i^2=-1`
`A^2=[(-1,0),(0,-1)]`
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