Ask Physics has installed the Latex server and now users can type latex code to insert complex equations to their comments or questions.
If you are not familiar with latex code, use the following site to generate the code for the equation that you need.
When you visit the above site you can edit and view the result of the code generate. You have the option to copy the image of the equation or to copy the code itself (what you typed for getting the image equation; not the html code supplied) and paste the code in your comment.
Go, Try it Now!