This would work out of the box with the [QuickLaTeX](http://wordpress.stackexchange.com/a/1501/11817) plugin (which I believe is only available for self-hosted WP blogs so I'm not sure this applies to the OP). The input

    [latex][+preamble]\usepackage{amsmath}[/preamble]
    \begin{align*}
      \int \frac{1}{(2x^{2}+4x-2)^{-\frac{3}{2}}} \textrm{d}x
        &= \frac{\sqrt{2}}{8} \int\frac{\sec{t} \cdot \tan{t}}{\tan^{3}{t}} \textrm{d}t \\
        &= \frac{\sqrt{2}}{8} \int\frac{\cos{t}}{\sin^{2}{t}} \textrm{d}t
    \end{align*}[/latex]

gives me on my blog

![enter image description here][1]


  [1]: https://i.sstatic.net/1dr8O.png