Algebra

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$\small The \: value \: of\: \left (\frac{-1+i\sqrt{3}}{2} \right )^{n}+\left (\frac{-1-i\sqrt{3}}{2} \right )^{n}\: where\: n\: is\: not\: a\: multiple\: of\: 3\:$

and $\small i=\sqrt{-1}$

-1

-i

Explanation:

By: Munesh Kumari

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