A:x24+y2=1
B:x29+y2=1
C:x2+y29=1
D:x2+y24=1
集合P={x|a+1≤x≤2a+1},Q={x|﹣2≤x≤5}
(1)若a=3,求集合(∁RP)∩Q;
(2)若P⊆Q,求实数a的取值范围.
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