If a(r)= (cos 2r pi + i sin 2r pi)^(1/9)...

If `a_(r)= (cos 2r pi + i sin 2r pi)^(1/9)`. Then the value of `|(a_(1),a_(2),a_(3)),(a_(4),a_(5),a_(6)),(a_(7),a_(8),a_(9))|` is

`-1`

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