Bugs about simpilfy function in the cas

[DrD]

(09-11-2017 01:27 PM)wangchong01 Wrote:  

(09-11-2017 11:32 AM)DrD Wrote:  [CAS] Exact[✔]
factor(((x^2-4)/(x^2+x-6))) ==> (x+2)/(x+3)

[CAS] Exact[ ]
factor(((x^2-4)/(x^2+x-6))) ==> (x-2)*(x+2)/((x-2)*(x+3))

Shouldn't a Simplify setting of "None" fully factorize the functions, and not mask the (x-2) term?

The simplify will ignore approx expressions such as (1.1*x)/x. You can you normal() to "simplify" the function and then simplify().

The objective is to quickly obtain a fully factorized result, such as might be needed by a student interested in evaluating continuity, and limits. I was hoping to show that the machine is making work, instead of saving work, by requiring the extra student interaction to satisfy the machine, in order to reach the objective.

I'm not sure I have a valid concern here. It may well be that the (x-2) term in numerator and denominator are 'artificial' singularities. I see them as necessary for domain clarity. Diverting attention from the study of a problem, to a study of the machine, may find students frustrated with both; and educators frustrated with the machine.

-Dale-