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![[Post New]](/templates/default/images/icon_minipost_new.gif) 19 Jun 2008 22:32:24 IST
Accepted Answer [?]
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to verify it shud be proved dat-
cos 2/pi7 + cos 4pi / 7 +cos 6pi/7 =-1/2
also cos2pi/7cos4pi/7+cos2pi/7 cos 6pi/7+cos 4pi/7 cos6pi/7=-1/2
and lastly,
cos 2pi/7 x cos 4pi / 7 x cos 6pi/7=1/8
these proofs give u d proof
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