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answered 2022-10-14 15:04:26 +0100
WorksForMe(TM) on Sage 9.8.beta1:
sage: var("a, b") (a, b) sage: log(a/b).log_expand() log(a) - log(b) sage: log(a/b).log_expand().log_simplify() log(a/b)
HTH,