Put equations in Google Docs™  or Google Slides™  with the power of LaTeX and the simplicity of a graphical editor. This editor is based on MathQuill, the same GUI-based math editor used by the popular online graphing calculator Desmos. LaTeX can also be inserted directly. 

Key Features:
-Equations are editable. Once the equations are exported, they can be re-imported using the Import Saved Equation button.
-Offers control of font size and DPI.
-Equations preview.

Permissions Explained
View and manage documents that this application has been installed in - To insert equations into a google document the add-on needs to be able to edit the document.
Connect to an external service - This add-on needs to connect to an external service to render the LaTeX code.
Display and run third-party web content in prompts and sidebars inside Google applications - This permission is necessary to use a GUI editor in the sidebar.