Posted by angie on Monday, January 2, 2012 at 11:37am.
x^3 - 1 = (x-1)(x^2 + x + 1)
x^2 - 1 = (x-1)(x+1)
as x->1, you get (1+1+1)/(1+1) = 3/2
As x -> -1 you get 1/0, + or - depending on the direction.
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