How to use MathJax

 To use MathJax in your pages: First, load MathJax.js   Then include mathematics in your page: ... we see that $$y = \frac{1}{x^2-1}$$ when \(x \ne \pm 1). ... or ... we see that $y = \frac{1}{x^2-1} \hbox{ when x \ne \pm 1.}$ ...