iations in <tt>a</tt> are evaluated, i.e., <tt>'diff</tt> in <tt>
    a</tt> is replaced by <tt>diff</tt>).  For brevity in a manual command
  (i.e., not inside a user-defined function), the <tt>ev</tt> may be
  dropped, shortening the syntax to <tt>a,b1,b2,...,bn</tt>.</dd>
 <dt><b><tt>expand(a)</tt></b></dt>
	<dd> Algebraically expands <tt>a</tt>.  In particular
  multiplication is distributed over addition.</dd>
 <dt><b><tt>exponentialize(a)</tt></b></dt>
	<dd> Transforms all trigonometric functions
  in