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

<problem>
    <script type="loncapa/perl">
$a1=&random(3,6,1);
$e1=&random(3,6,1);
$a2=&random(6,8,1);
$e2=&random(6,8,1);
$da1=$a1*$e1;
$da2=$a2*$e2;
$de1=$e1-1;
$de2=$e2-1;
@derivative=($da1.'t^'.$de1,$da2.'t^'.$de2);
@wrongderivative=($a1.'t^'.$de1,$a2.'t^'.$de2);
    </script>
    <startouttext />
What is the derivative of
<m eval="on">\[\left(\begin{array}{c}$a1 t^$e1\\ $a2 t^$e2\end{array}\right)\]</m>
with respect to <m>$t$</m>?
    <endouttext />
    <formularesponse answer="@derivative" samples="t@-10:10#10">
        <textline readonly="no" size="25" />
        <hintgroup showoncorrect="no">
            <formulahint answer="@wrongderivative" name="nomulti" samples="t@-10:10#10"></formulahint>
            <hintpart on="nomulti">
                <startouttext />You need to multiply with the original exponent.<endouttext />
            </hintpart>
        </hintgroup>
    </formularesponse>
</problem>