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If you are looking for a numerical approximation, there are several routes open to you. Here are two.

  • You can approximate after taking it with e.g. a.n(digits=100), like here
  • You can use a decimal point like 383. instead of 383 and then do the root

More advanced options include setting a "real field" with a certain accuracy like R=RealField(1000) and using that ...