If $z = 1 - \cos \alpha + i\sin \alpha $, then $amp \ z$=
If $z = 1 - \cos \alpha + i\sin \alpha $, then $amp \ z$=
- A
$\frac{\alpha }{2}$
- B
$ - \frac{\alpha }{2}$
- C
$\frac{\pi }{2} + \frac{\alpha }{2}$
- D
$\frac{\pi }{2} - \frac{\alpha }{2}$
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