The BIE-ZMA course is taught at the Faculty of Information Technology, therefore many students have a warm relationship to the various computer algebraic systems (CAS), be it particular programs ( Mathematica, Maple, Matlab, Sage, Maxima,…) or on-line applications ( WolframAlpha, CoCalc). We would like to point out here that although we generally welcome the use of these systems, users that are not familiar with various parts of mathematics may find the outputs and behaviour of such systems confusing.
We will mention some of the classic traps.