In Maple, dividing by zero produces a division by zero error. However, sometimes the division by zero is not apparent.

Example 1

Solution: Replace the NumericEventHandler for division by zero.

Example 2

The weakness is in int, which does not identify  as equal to 0.  Simplifying the expanded output from int then leads to division by zero. A stronger zero-testing routine is required earlier in the process. However, using the strongest possible zero-testing routine by default is inefficient.

Solution 1: For a single expression, simplify before taking the integral.

Solution 2: For numerous expressions, control zero-testing using Normalizer.

int, ln, Normalizer, NumericEventHandler, simplify, tan