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For a complex number Z. If arg(Z) in (-p...

For a complex number Z. If `arg(Z) in (-pi, pi]`, then `arg{1+cos.(6pi)/(7)+isin.(6pi)/(7)}` is (here `i^(2)=-1`)

A

`(3pi)/(7)`

B

`(2pi)/(7)`

C

`-(2pi)/(7)`

D

`-(3pi)/(7)`

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The correct Answer is:
A
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