Different result in Integral

[parisse]

I do not share your opinion compsystems, I really believe that students should learn a little bit how things work, and that includes understanding the output format of a solve command with 2 variables. Otherwise, as soon as the system was not programmed to solve their exercise, they are lost. On the other hand, the student who understands a little bit what happens can help the system solve his problem by assembling all the tools available to him. CAS are here to do the boring computing-intensive tasks, while humans are the brains that direct them.