## Tex Example

\begin{aligned} \dot{x} & = \sigma(y-x) \\ \dot{y} & = \rho x - y - xz \\ \dot{z} & = -\beta z + xy \end{aligned}
$\left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)$

## MathML

$x=\frac{-b±\sqrt{{b}^{2}-4ac}}{2a}$

## AsciiMath

When a != 0, there are two solutions to ax^2 + bx + c = 0 and they are

x = (-b +- sqrt(b^2-4ac))/(2a) .