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For two unimodular complex numbers z(1) ...

For two unimodular complex numbers `z_(1)` and `z_(2)`, find `[(bar(z)_(1),-z_(2)),(bar(z)_(2),z_(1))]^(-1) [(z_(1),z_(2)),(-bar(z)_(2),bar(z)_(1))]^(-1)`

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