[tex]\pi \pi \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] x^{2} x^{2} \sqrt{x} \neq \lim_{n \to \infty} a_n \int\limits^a_b {x} \, dx x^{2}[/tex] x^{2} \sqrt{x} \neq \lim_{n \to \infty} a_n \int\limits^a_b {x} \, dx x^{2}