Question Number 39018 by maxmathsup by imad last updated on 01/Jul/18
![find nature of Σ_(n=0) ^∞ (((−1)^([x]) )/(2+cos(n[x])))](https://www.tinkutara.com/question/Q39018.png)
$${find}\:{nature}\:{of}\:\sum_{{n}=\mathrm{0}} ^{\infty} \:\:\:\:\frac{\left(−\mathrm{1}\right)^{\left[{x}\right]} }{\mathrm{2}+{cos}\left({n}\left[{x}\right]\right)} \\ $$
find-nature-of-n-0-1-x-2-cos-n-x-