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If z^(1) =2 -I, z(2)=1+i, find |(z(1) + ...

If `z^(1) =2 -I, z_(2)=1+i`, find `|(z_(1) + z_(2) + 1)/(z_(1)-z_(2) + 1)|`

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The correct Answer is:
`sqrt(2)`
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