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proof (-1^3)= (-1)(-1)(-1)= (-1)(1) as minus minus is plus then we get -1 cux 3 is odd
then (-1)^2 = (-1)(-1) minus minus is plus= 1 as 2 is even
then (-1)^2 = (-1)(-1) minus minus is plus= 1 as 2 is even