R Hansen says: >The last thing I would do, unless my students are far enough along, is to give them this problem and have them discuss it amongst themselves. That is just wasting their hour. I am the expert and I am supposed to be using that to reach them how to be experts. I am supposed to be coaching them.
I liked your (prior to this) discussion about pointing out various feature of the problem, but I'd certainly let them solve it themselves, individually (I'm assuming calc1). Its just an exercise.