Please use a tool like this as an equation editor on the VE.--ManosHacker (talk) 21:14, 10 April 2015 (UTC)
Topic on VisualEditor/Feedback
Math is a very difficult area, because it is still very badly supported by browsers. It will take time for the world to improve in that area. The editor in question that you point to is unfortunately Flash and also not open source, so an alternative will need to be found, or developed from scratch, probably requiring significant time and investment. There is also a usability issue, as you can see the editor requires quite a bit of screen real-estate, and that is a challenge.