MathJax with Reveal — Right Way

Press to reveal some math below:

This file is loaded by jQuery and then typeset by MathJax.

An equation is $$E=mc^2$$.

Another equation is $$\sum_{i=1}^{n} i = {n(n+1)\over 2}.$$
The final equation is $$\int f(x)+g(x)\,dx = \int f(x)\,dx + \int g(x)\,dx$$ where $$f$$ and $$g$$ are integrable functions.