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Question Number 28363 by abdo imad last updated on 24/Jan/18

$$simlifythesumS=\sum _{k=0}^{n-1}\frac{x+e^{i2k\pi }}{x-e^{i2k\pi }}.$$

Answered by ajfour last updated on 24/Jan/18

$$S=\frac{n(x+1)}{x-1}.$$

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