Menu Close

find-k-0-n-1-1-k-cos-n-kpi-n-




Question Number 30587 by abdo imad last updated on 23/Feb/18
find Σ_(k=0) ^(n−1)  (−1)^k  cos^n (((kπ)/n)).
$${find}\:\sum_{{k}=\mathrm{0}} ^{{n}−\mathrm{1}} \:\left(−\mathrm{1}\right)^{{k}} \:{cos}^{{n}} \left(\frac{{k}\pi}{{n}}\right). \\ $$

Leave a Reply

Your email address will not be published. Required fields are marked *