[latex] \lim_{n \to \infty} a_n \left[\begin{array}{ccc}123\\456\\789\end{array}\right] x^{123} x_{123} \frac{x}{y} \int\limits^a_b {x} \, dx \sqrt{x} \left \{ {{y=2} \atop {x=2}} \right. \\ [/latex]