I've been noticing that we get a lot of questions like Why do I get two different answers while doing this simple limit math?
It's basically the traditional thing where people don't understand where you need both limits to exist for the product of the functions/sequences to exist. I'm thinking about in the future when I see this sort of question, I'll post above link and say the traditional "Does this answer your question?"
Does this sound like a good idea? Also, would questions that are like the above be considered a duplicate?