√(-x？ + 2x -2)=
√[-(x？ - 2x +2)=
√-[(x - 1)？ + 1]
(x - 1)？ + 1 & gt； 1
So:
-[(x - 1)？ + 1]& lt； - 1
√ The number in it is greater than or equal to 0, otherwise it is meaningless.
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