math pre calculus

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Let A=(-2,INF] and B=(2,INF). FIND:

a.)AUB

b.)A (UPSIDE DOWN "U")B

c.)A\B

d)B\A

*I was thinking a was (-2,inf), b was (-1,2), c was (-1,1) and d was (2,inf) but i don't think that is right since i don't have a U in the answers.

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