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If A=(1)/(2)(""(1)^(0)" "(0)^(1)),B=(1)/...

If `A=(1)/(2)(""_(1)^(0)" "_(0)^(1)),B=(1)/(2)(""_(i)^(0)" "_(0)^(-i))` and `C=(""_(0)^(1)" "_(-1)^(0))`, show that,
`A^(2)+B^(2)+C^(2)=(3)/(2)I`.

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