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If alphar=(cos2rpi+isin2rpi)^(1/10), the...

If `alpha_r=(cos2rpi+isin2rpi)^(1/10)`, then `|(alpha_1, alpha_2, alpha_4),(alpha_2, alpha_3, alpha_5),(alpha_3, alpha_4, alpha_6)|=` (A) `alpha_5` (B) `alpha_7` (C) `0 (D) none of these

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