CAS command question

[Han]

(01-03-2017 11:33 AM)DrD Wrote:  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?

Regarding 2, this has always been the behavior. A literal (symbolic) expression requires quotation (single quotes). These are left unevaluated. Otherwise, it is "evaluated" as is normally done when entering commands on the command line. Simple example:

x:=t;
x+y // returns t+y
'x+y' // returns x+y

EDIT:

Quote:left('x+y<4'); ==> x+y
left(CAS("x+y<4")); ==> 4

The second case uses evaluation. left(CAS(" 'x+y<4' ")) will return x+y