You can even paste in equations from existing TeX documents.

TeX editing can be mixed with point-and-click editing so you get the best of both worlds. ▲ Type TeX or LaTeX: If you already know the TeX typesetting language, you can enter equations directly into MathType 7 or Microsoft Word documents. MathType has customizable keyboard shortcuts for virtually every symbol, template, and command. ▲ Keyboard Shortcuts: Save time using keyboard shortcuts. MathType applies mathematical spacing rules automatically as you type.

▲ Point-and-Click Editing with Automatic Formatting: Create equations quickly by choosing templates from MathType's palettes and typing into their empty slots. ▲ Entering Math by Hand: Enter equations as easily as you would write math with paper and pencil! This feature uses the built-in handwriting recognition in Windows 7 and later. MathType is a powerful interactive equation editor for Windows and Macintosh that lets you create mathematical notation for word processing, web pages, desktop publishing, presentations, elearning, and for TeX, LaTeX, and MathML documents.

MathType 7.6.0.156 downloading