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Answer :

[tex]i=\sqrt[]{-1}[/tex][tex]\begin{gathered} i^2=(\sqrt[]{-1})^2 \\ i^2=-1 \end{gathered}[/tex][tex]\begin{gathered} i^3=i^2\times i \\ i^3=-1\times i \\ i^3=-i \end{gathered}[/tex]

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