Is there a tool to create maths formulae more easily? - Yes: The extension Dmaths.org!
Dmaths is an extension to help create formulae more quickly.
Furthermore, it includes different tools to draw graphs, construct geometric figures (2D and 3D) and many more.
Download the extension from http://dmaths.org Get more information in German and some hints in English at http://dmaths.friege.de Consider to help translating dialoges and manual of Dmaths to more languages!