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Question Number 76075 by benjo last updated on 23/Dec/19

$$\mathrm{how}\mathrm{i}\mathrm{evaluate}\sin \left(\pi /7\right)\times \sin \left(2\pi /7\right)\times \sin \left(3\pi /7\right)$$$$\mathrm{please}\mathrm{help}\mathrm{me}$$

Answered by john santuy last updated on 23/Dec/19

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