olymmath

HMMT 2007 K8

  • Calculus
  • Answer

Suppose that ω\omega is a primitive 2007th 2007^{\text {th }} root of unity. Find (22007−1)∑j=1200612−ωj\left(2^{2007}-1\right) \sum_{j=1}^{2006} \frac{1}{2-\omega^{j}}.

For this problem only, you may express your answer in the form m⋅nk+pm \cdot n^{k}+p, where m,n,km, n, k, and pp are positive integers. Note that a number zz is a primitive nth n^{\text {th }} root of unity if zn=1z^{n}=1 and nn is the smallest number amongst k=1,2,…,nk=1,2, \ldots, n such that zk=1z^{k}=1.

Dataset text NuminaMath olympiads. Quoted with source.

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2005 \cdot 2^{2006}+1

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