Texas Instruments TINSPIRE Manual Book page 435

.
2. Press .
The expression and its result are removed.
Clearing the Calculator history
When you clear the history, all variables and functions defined in the
history retain their current values. If you clear the history by mistake, use
the undo feature.
To clear the history,
– From the
All expressions and results are removed from the history.
menu, select
Actions
.
Clear History
Calculator 423