In other words your example was correctly determined as undecidable
in the default domain CIF but Maxima then said the relation is true so
__nonzero__ took that.

sage: from sage.symbolic.relation import test_relation_maxima
sage: test_relation_maxima(sin(1 + 2^-200) == sin(1)) 

This means for serious work not to use __nonzero__()
at the moment until there is a solution returning three values
(Yes/No/Maybe) like test_relation() above.

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