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Question Number 29457 by prof Abdo imad last updated on 08/Feb/18
$${let}\:{give}\:{P}_{{n}} \left({x}\right)=\:\prod_{{k}=\mathrm{1}} ^{{n}} {ch}\left(\frac{{x}}{\mathrm{2}^{\left.{k}\right)} }\right)\: \\ $$$${find}\:{lim}_{{n}\rightarrow+\infty} {P}_{{n}} \left({x}\right)\:. \\ $$