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Question Number 29839 by abdo imad last updated on 12/Feb/18 | ||
$${find}\:\prod_{{n}=\mathrm{1}} ^{\infty} \:\left(\mathrm{1}−\frac{{x}^{\mathrm{2}} }{{n}^{\mathrm{2}} \pi^{\mathrm{2}} }\right). \\ $$ | ||