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Question Number 112254 by john santu last updated on 07/Sep/20
   sin ((π/( 7))).sin (((2π)/7)).sin (((3π)/7)) =?
$$\:\:\:\mathrm{sin}\:\left(\frac{\pi}{\:\mathrm{7}}\right).\mathrm{sin}\:\left(\frac{\mathrm{2}\pi}{\mathrm{7}}\right).\mathrm{sin}\:\left(\frac{\mathrm{3}\pi}{\mathrm{7}}\right)\:=? \\ $$
Answered by bemath last updated on 07/Sep/20

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