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SymPy ensures constant simplification by implementing exact arithmetic and applying mathematical rules that are always valid. This means that SymPy represents numbers and expressions exactly, rather than using floating-point approximations, so there is no loss of precision during the simplification process. It also has a large library of algebraic rules and techniques that are guaranteed to produce equivalent expressions, regardless of the input. Finally, SymPy allows users to customize and control the simplification process using various options and strategies to suit their specific needs. Overall, these factors ensure that SymPy consistently performs reliable and accurate simplifications.