Question Number 166006 by tabata last updated on 11/Feb/22
$${chek}\:{the}\:{series}\:\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\:{cos}\left({n}\right)\:{sin}^{\mathrm{2}} \left(\frac{\mathrm{1}}{{n}}\right)\:{is}\:{converge}\:{or}\:{diverge}\:? \\ $$