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  1. or download this
    Calculator 10.2103.8.0
© 2021 Microsoft. All rights reserved
...
-32   ^   0.2 =
2
  2. or download this
    perl -MMath::Prime::Util::GMP=:all -le 'print powreal(-4, .5)'
-2.000000000000000000000000000000000000000

perl -MMath::Prime::Util::GMP=:all -le "print rootreal(-4, 2)"
# aborted, core dumped