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If z is a complex number satisfying the ...

If `z` is a complex number satisfying the equation `Z^(6)+Z^(3)+1=0`. If this equation has a root `re^(I theta)` with `90^(@) lt theta lt 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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The correct Answer is:
A
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