x=a+b , y=aw+bw² , z=aw²+bw , prove that xyz =a³+b³
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here should be mentioned that w is not equal to 1
then
w³-1=0
(w-1)(w²+w+1)=0
w=1
or
w²+w+1=0
also w is an imaginary number
remember
w²+w+1=0
i used this identity everywhere
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