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The argument of the complex number `sin  (6pi)/5+i(1+cos   (6pi)/5)` is

The argument of the complex number `sin  (6pi)/5+i(1+cos   (6pi)/5)` is

A.

`(6pi)/5`

B.

`(5pi)/6`

C.

`(9pi)/10`
D.

`(2pi)/5`

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