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![[Post New]](/templates/default/images/icon_minipost_new.gif) 15 Jan 2008 10:24:09 IST
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1+w+w^2=0
1+w^2=-w
sub in eqn similarly w^4=w therefore 1+w=-w^2,w^8=w^2therfroe(1-w^4+w^8)=(-2w)
(-2w)(-2w^2)(-2w)...........upto2n factors=2^n
hence proved(becuase first two terms becomes 4 hence all terms will become four
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