Mac Grapher has is a keyboard shortcut for entering superscripts: use the
^ key. For instance, you can type
x^2 to get the expression x2.
Once I've entered superscript mode, how do I leave superscript mode? For instance, if I want to enter in the expression x2 + 3, what do I type? If I type the characters
x^2 + 3 on the keyboard, I get the expression x2 + 3, which is not what I wanted.
I couldn't find any description of this in the help pages for Grapher.