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FilledSmallSquareExpandAll[expr] expands out all products and integer powers in any part of expr.

FilledSmallSquareExpandAll[expr, patt] avoids expanding parts of expr that do not contain terms matching the pattern patt.

FilledSmallSquareExpandAll[expr] effectively maps Expand and ExpandDenominator onto every part of expr.

FilledSmallSquare See The Mathematica Book: Section 1.4.5 and Section 3.3.3.

Further Examples