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If z is a complex number satisfying the equation `z^6 +z^3 + 1 = 0`. If this equation has a root `re^(itheta)` with `90^@<0<180^@` then the value of `theta` is

A

`40^(@)" or "80^(@)`

B

only `40^(@)`

C

only `80^(@)`

D

none of these

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A
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