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Algebraic to symbolic expression

Hello! When I write AA(sqrt(3)+sqrt(2)) i get 3.146264369941973?, and I use to recover the original symbolic expression sqrt(2)+sqrt(3) simply by asking the minimal polynomial of 3.146264369941973?, which is of degree 4, and looking for the appropiate root. But I want to know if there is a reasonable way to get the symbolic expression from an algebraic expression which I know it comes from a lot of operations, knowing that the function "minpoly()" in that case does not give an answer for hours. I hope you can help me!!!