First simplify, then evaluate: LX + 1 − 1x2 − 1 △ x + 1x2 − 2x + 1, where x = 3-1

The original formula = 1 x + 1 − 1 (x + 1) (x − 1) · (x − 1) 2x + 1 = 1 x + 1 − x − 1 (x + 1) 2 = (x + 1) − (x − 1) (x + 1) 2 = 2 (x + 1) 2, when x = 3-1, the original formula = 2 (3 − 1 + 1) 2 = 23

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