Let A={x:x ∈ R,−1≤x≤1} and B={x:x ∈ R,|x|≤1}The sets A and B are equal.
Let A={x:x∈R,|x|<1}; B={x:x∈R,|x−1|≥1} and
A∪B=R−D, then the set D is
Let A = { x : x ∈ R, |x| < 1}; B = {x : x ∈ R, |x-1| ≥ 1} and
A ∪ B = R - D, then the set D is