Question: Minimal polynomial of algebraic number using maple

Hello everybody, I was wondering if one can find the minimal (or "irreducible") polynomial of a algebraic number. For example, x^3+6x+8 is irreducible. We do alias(theta = RootOf(x^3+6x+8) ); Then we are looking for the minimal polynomial of (theta^2)/2 for example.. How can we find this minimal polynomial? Is there a simple command in maple? Thanks in advance.
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