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Let xxx be a non-real number that satisfy the equation x4=1x^{4}=1x4=1. Find the value of ∑n=02015(xn+1xn)\displaystyle \sum_{n=0}^{2015} \left (x^{n}+\frac{1}{x^{n}} \right)n=0∑2015(xn+xn1).
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