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If A=[(i,0),(0,-i)],B=[(0,-1),(1,0)] and...

If `A=[(i,0),(0,-i)],B=[(0,-1),(1,0)]` and `C=[(0,i),(i,0)]` and I is the unit matrix of order 2, then show that
(i) `A^(2)=B^(2)=C^(2)=-I` (ii) `AB=-BA=-C`.

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