Standard-all ckeditor setup includes MathJax
This file: http://sdk.ckeditor.com/samples/mathjax.html plus additions for updating page.
Use Update button to copy text in editor above into region below.
Misc MathJax
\begin{align}
(x+1)^2
&= (x+1)(x+1)\\
&= x(x+1) + 1(x+1)
\end{align}
\begin{equation}
\left[
{\bf X} + {\rm a} \ \geq\
\underline{\hat a} \sum_i^N \lim_{x \rightarrow k} \delta C
\right]
\end{equation}