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If omega=alpha+ibeta, " where " beta ne ...

If `omega=alpha+ibeta, " where " beta ne 0,i=sqrt(-1) " and " z ne 1`, satisfies the condition that `((omega-bar(omega)z)/(1-z))` is purely real, the set of values of z is

A

` {z: |z|=1}`

B

`{z:z= bar z}`

C

`{z:z ne 1}`

D

` {z: |z|=1,z ne 1}` .

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