try to make polynomial smaller by substitutions
Important: The polytools package has been deprecated. Use the superseding command PolynomialTools[Shorten] instead.
This function applies transformations on f in an effort to make f smaller, more precisely, to make its length smaller. The following transformations are tried: adding or multiplying x by a constant, replacing x by its reciprocal, and combinations of these transformations.
When a field extension is given by an irreducible polynomial f this procedure can be used to search for a simpler polynomial representing the same field extension.
If f contains only one variable then the second argument x is optional.
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