Question Number 28980 by abdo imad last updated on 02/Feb/18
$${prove}\:{that}\:{sin}\left(\pi{z}\right)=\pi{z}\:\prod_{{k}=\mathrm{1}} ^{\infty} \left(\mathrm{1}−\frac{{z}^{\mathrm{2}} }{{k}^{\mathrm{2}} }\right)\:\:{zfromC}. \\ $$
prove-that-sin-piz-piz-k-1-1-z-2-k-2-zfromC-