g(Math) is an add-on for the Chrome browser which allows you to incorporate formulas into your documents, forms and sheets. Click on the link below to add the respective add-ons to your browser:
Click on the free button to install and then allow permission for it to run.
After you have granted permission to access your drive you should now see the icon added to the top right Forms menu bar.
Install the add-on from the links on the right prior to watching their playlists.