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- trying to make the problem code prettier
- addin sample points to HintFormula.problem
- remove tolerance specfication from CAS fomularesponse

    1: <problem>
    2:     <script type="loncapa/perl">
    3: $a1=&random(3,6,1);
    4: $e1=&random(3,6,1);
    5: $a2=&random(6,8,1);
    6: $e2=&random(6,8,1);
    7: $da1=$a1*$e1;
    8: $da2=$a2*$e2;
    9: $de1=$e1-1;
   10: $de2=$e2-1;
   11: @derivative=($da1.'t^'.$de1,$da2.'t^'.$de2);
   12: @wrongderivative=($a1.'t^'.$de1,$a2.'t^'.$de2);
   13:     </script>
   14:     <startouttext />
   15: What is the derivative of
   16: <m eval="on">\[\left(\begin{array}{c}$a1 t^$e1\\ $a2 t^$e2\end{array}\right)\]</m>
   17: with respect to <m>$t$</m>?
   18:     <endouttext />
   19:     <formularesponse answer="@derivative" samples="t@-10:10#10">
   20:         <textline readonly="no" size="25" />
   21:         <hintgroup showoncorrect="no">
   22:             <formulahint answer="@wrongderivative" name="nomulti" samples="t@-10:10#10"></formulahint>
   23:             <hintpart on="nomulti">
   24:                 <startouttext />You need to multiply with the original exponent.<endouttext />
   25:             </hintpart>
   26:         </hintgroup>
   27:     </formularesponse>
   28: </problem>