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Question Number 56830 by maxmathsup by imad last updated on 24/Mar/19

let A_n =Π_(k=0) ^(n−1)  cos(kx)   find a simple form of A_n

$${let}\:{A}_{{n}} =\prod_{{k}=\mathrm{0}} ^{{n}−\mathrm{1}} \:{cos}\left({kx}\right) \\ $$$$\:{find}\:{a}\:{simple}\:{form}\:{of}\:{A}_{{n}} \\ $$

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