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已知集合B={y|y=cosx,x∈R},B={x|x2<9},那么A∩B( )...
已知集合B={y|y=cosx,x∈R},B={x|x2<9},那么A∩B( )
A.∅
B.[-1,3)
C.(1,3)
D.[-1,1]
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