Sx-2, r<0, x+2, r 0 9. Let f: R R be defined by f(x) = ', then f-(]1,3[) (the inverse image of the interval ]1, 3[ under f) is (a) ]3, 5[U] – 1, 1[ (b) [0, 1[ (c) 1- 1, 1[ (d) None of the above

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