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The function get_systems from sage.misc.citation will tell you the backends used to evaluate some code. For example,

sage: from sage.misc.citation import get_systems sage: get_systems('sqrt(x)') ['MPFI', 'MPFR', 'GMP'] sage: get_systems('sqrt(3.4)') ['MPFR']

The function get_systems from sage.misc.citation will tell you the backends used to evaluate some code. For example,

sage: from sage.misc.citation import get_systems
sage: get_systems('sqrt(x)') 
['MPFI', 'MPFR', 'GMP']
sage: get_systems('sqrt(3.4)')
['MPFR']

['MPFR']