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lang-mma
Seriesor bug in your code, because forA=a^4it does not seem to produce a correct output. Looks more like a bug inSeriesthough. $\endgroup$a^4 == Times[a,a,a,a]$\endgroup$(Normal@Series[(A + 1) /. v : Alternatives @@ Variables[A] :> v $t, {$t, 0, 1}] /. $t -> 1) - 1$\endgroup$