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Find AcupB,A capB,A-B and B-A If A={x,...

Find `AcupB,A capB`,`A-B and B-A`
If A=`{x, x in R} : B = {x,absx le3}`

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`A cupB=R,A capB=[-3,3]`
A~B =`(-infty,-3)cup(3,infty)`:(B~A)=`phi`
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