e last <tt>a</tt> (an integer)
  labels and their associated expressions.  If <tt>a</tt> is omitted,
  all lines are played back.  See the Manual for other options.</dd>
 <dt><b><tt>ratsimp(a)</tt></b></dt>
	<dd> Simplifies <tt>a</tt> and returns a quotient of
  two polynomials.</dd>
 <dt><b><tt>realpart(a)</tt></b></dt>
	<dd> Returns the real part of <tt>a</tt>.</dd>
 <dt><b><tt>rhs(a)</tt></b></dt>
	<dd> Gives the right-hand side of the equation <tt>a</tt>.</dd>
 <dt><b><tt>save(a,b1,b2,..., bn)</tt></b><