rated expressions.</dd>
 <dt><b><tt>ident(a)</tt></b></dt>
	<dd> Returns an <tt>a</tt> &times;&nbsp;<tt>a</tt>
  identity matrix.</dd>
 <dt><b><tt>imagpart(a)</tt></b></dt>
	<dd> Returns the imaginary part of <tt>a</tt>.</dd>
 <dt><b><tt>integrate(a,b)</tt></b></dt>
	<dd> Attempts to find the indefinite integral
  of <tt>a</tt> with respect to <tt>b</tt>.</dd>
 <dt><b><tt>integrate(a,b,c,d)</tt></b></dt>
	<dd> Attempts to find the indefinite
  integral of <tt>a</tt> with respect to <tt>b</tt>. taken from
  