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Mathematics in senior one. Winter vacation homework. Ask for a detailed answer process or you won't get points. Thank you.
Option d

Because f(x) is increasing function, we can draw |f(- 1)|=|f(2)|= 1 through point A and point B.

So the solution set of | f (x) | < 1 is. (- 1,2)

Its complement is. (-∞, - 1)∪[2,+∞]

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