Copper (AUB) is contained in c.
-a- 1 & lt; 0a & gt; - 1
a+2 & gt; = 4a & gt; =2
Existence, the value range of a:
b={x|x^2-4<; 0}=(-2,2)
A∩B=
(2)CRA=(-∞, 1/2)U(3,+∞)
b={x|x^2<; -a}=(-√(-a),√(-a))
(CuA)∩B=B
√(-a)& lt; 1/2
-a & lt; 1/4
a & gt- 1/4
Or-√ (-a) > three
-a & gt; nine
a & lt-9
The range of a is (-∞, -9)U(- 1/4,+∞).