Inconsistency CAS vs. Home

[Joe Horn]

(10-16-2015 02:12 AM)lrdheat Wrote:  In CAS, the integral of
((x+1)/(x^2+2*x)-(x+4)/(x^2+x)+(3/(x^2+3*x+2)) from -4 to 12 produces "undef". In HOME, it produces "Error: Invalid input"

Why the difference?

Did you remember to replace the x's (lowercase) with X's (uppercase) in Home? (You can't use undefined variables in Home like you can in CAS.) When I do that integral in Home, using X's, I get the same "undef" as in CAS.