CAS command question

[DrD]

Parisse,

1. I probably don't understand the real purpose of those two CAS commands. Can you explain further? (ex: Compared to the similar commands in TI-Basic?)
http://tibasicdev.wikidot.com/68k:left

2. If the intent IS to return the indicated side of an expression or interval, why was it necessary to first evaluate the expression?

3. If it is NOT necessary to first evaluate the expression, would you consider changing that behavior for the next release?

4. Is there an alternative built in command that WILL return left or right sides, or even better, a list of the left and right sides of an expression?

Thank you.

-Dale-