a^2
a^x
a_x
\sqrt{x}
\frac{a}{x}
\left|x\right|
\lceil x\rceil
\lfloor{x}\rfloor
\frac{\text{d}x}{\text{d}y}
\frac{\partial x}{\partial y}
\int_{x}^{y}
\oint_{x}^{y}
\log_xy
\lim_{x \rightarrow y}
\sum_x^y
\prod_x^y
\overleftarrow{xy}
\overline{xy}
\overrightarrow{xy}
\cdot