Multiply: \ac3a\ot\aca29\ac{3}{a} \ot \ac{a^2}{9}\ac3a\ot\aca29.
\aca3\ac{a}{3}\aca3
\ac3a\ac{3}{a}\ac3a
\ac3a9\ac{3a}{9}\ac3a9
3a3a3a