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[teerasak]

When I use command domain(1/sqrt(9-x^2))

- it gives x>=-3 AND 3<=x and x<>-3AND x<> 3 which is verbose result. It should be x>-3, ANd 3<x - which is more readable.
- when simplifying the expression, it gives wrong result - x> -3 AND 3 > x.