Question Number 146504 by tabata last updated on 13/Jul/21
$${find}\:{the}\:{sigular}\:{point}\: \\ $$$$ \\ $$$$\left(\mathrm{1}\right){f}\left({z}\right)={ln}\mid{z}\mid \\ $$$$ \\ $$$$\left(\mathrm{2}\right){f}\left({z}\right)=\frac{\mathrm{1}−{cosz}}{{sinz}^{\mathrm{2}} } \\ $$