a^2-2<； a

a^2-a-2<； 0

(a- 1/2)^2<； 9/4

A belongs to (-2,2), and because A.

When a is greater than or equal to 0, substitute the second function.

2/3a- 1 & lt； a

a & gt-3

And because a is greater than or equal to 0, a is greater than or equal to 0.

To sum up, A belongs to (-2,+infinity).