find-laurent-series-f-z-cos-iz-z-n-z-i-gt-2-

Question Number 148638 by tabata last updated on 29/Jul/21

$${find}\:{laurent}\:{series}\:{f}\left({z}\right)=\frac{{cos}\left({iz}\right)}{{z}^{{n}} }\:\:,\mid{z}−{i}\mid>\mathrm{2} \\ $$

Commented by tabata last updated on 29/Jul/21

$$???? \\ $$