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The principal value of arg (z), where z=...

The principal value of `arg (z)`, where `z=1+cos((8pi)/5)+i sin((8pi)/5)` (where, `i=sqrt-1) ` is given by

A

`-(pi)/(5)`

B

`-(4pi)/(5)`

C

`(pi)/(5)`

D

`(4pi)/(5)`

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