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Complete solution set of the inequation ...

Complete solution set of the inequation `(x^2-1)(x^2-6x+8)geq0` is
(a) `x in [-1,1]uu[2,4]`
(b) `x in (-oo,-1)uu[1,2]uu[4,oo]`
(c) `x in [-1,2]uu[4,oo]`
(d) none of these

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