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Question Number 64173 by Eminem last updated on 14/Jul/19

$$showtbat\underset{k=1}{\prod ^n}(1-\frac{{sin}^2\left(\frac{\theta }{2n}\right)}{{sin}^2\left(\frac{2k-1}{4}\pi \right)})=cos\left(\theta \right)$$

Commented by Prithwish sen last updated on 15/Jul/19

$${\mathrm{Is}}^{\prime }\mathrm{nt}\mathrm{it}{\cos }^{\mathrm{n}}\left(\frac{\theta }{\mathrm{n}}\right)?$$

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