If abs(z)= 1 and omega = frac{z-1}{z+1} ...

If `abs(z)= 1` and `omega = frac{z-1}{z+1}` (where ` z !=``-1`), the `Re(omega)` is

A

A)0

B

B)`frac{1}{abs(z+1)^2`

C

C)`abs(frac{z}{z+1}.frac{1}{abs(z+1)^2`

D

D)`frac{sqrt2}{abs(z+1)^2}`

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