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If z(1) and z(2) are unimodular complex ...

If `z_(1)` and `z_(2)` are unimodular complex numbers that satisfy `z_(1)^(2)+z_(2)^(2)=4,` then `(z_(1)+bar(z)_(1))^(2)+(z_(2)+bar(z)_(2))^(2)` equals to

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