NewProb
is a utility that
1. Clears the HOME screen and history area. (F1, 8
also does this.)
2. Deletes all single-letter variables.
(F6, 1 also does this.)
3. Unchecks (but doesn't erase) all the function definitions
on the Y= screen, so that they won't graph.
(From the Y= screen, F5, 3 also does this.)
after:
