For all x in the domain of the function (x + 1)/(x^3 - x), this function is equivalent to
x + 1 x + 1 (x + 1) 1 1
_______ = _________ = _____________ = _______ = ______
x^3 - x x ( x^2 - 1) x ( x + 1) ( x - 1) x ( x -1) x^2 - x
