cos frac{pi }{7}cos frac{{2pi }}{7}cos frac{{ | vedclass

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Question

$\frac{1}{2 \sin \frac{\pi}{7}}\left[2 \sin \frac{\pi}{7} \cos \frac{\pi}{7} \cos \frac{2 \pi}{7} \cos \frac{\pi}{7}ight]$

$\frac{1}{2 	imes 2 \

Vedclass · Accepted Answer

$\frac{1}{8}$

Vedclass · Answer

$\frac{1}{2 \sin \frac{\pi}{7}}\left[2 \sin \frac{\pi}{7} \cos \frac{\pi}{7} \cos \frac{2 \pi}{7} \cos \frac{\pi}{7}ight]$

$\frac{1}{2 	imes 2 \sin \frac{\pi}{7}}\left[2 \sin \frac{2 \pi}{7} \cos \frac{2 \pi}{7} \cos \frac{3 \pi}{7}ight]$

$\frac{1}{2.4\sin \left(\frac{\pi}{3}ight)}\left(2 \sin 4 \frac{\pi}{7} \cos \frac{3 \pi}{7}ight)$

$\frac{1}{8 \sin \left(\frac{\pi}{7}ight)}\left[\sin (\pi)+\sin \left(\frac{\pi}{7}ight)ight]$

$\frac{\sin (\pi / 7)}{8 \sin (\pi / 7)}=\frac{1}{8}$

$\cos \frac{\pi }{7}\cos \frac{{2\pi }}{7}\cos \frac{{3\pi }}{7} =$

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