I'm new to writing questions in Moodle and am exploring STACK. I'd like to learn more about the equivalence reasoning and in particular how to use stack_equiv_find_step(ex, ex1) to see if a student answer includes a particular step.
When setting up the question, where do I place this? Am I right in thinking that 'ex' is the expression I'm looking for and 'ex1' is ans1 (the student answer)?
Does anyone have an example of this in action?