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Aromātai (complex solution)
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Tohaina

\sqrt{21}i
Tauwehea te -21=21\left(-1\right). Tuhia anō te pūtake rua o te hua \sqrt{21\left(-1\right)} hei hua o ngā pūtake rua \sqrt{21}\sqrt{-1}. Hei tōna tikanga, ko te pūtake rua o -1 ko i.