Think about the domain of the function EDIT: Someone already provided the answer here https://news.ycombinator.com/item?id=30146426 https://news.ycombinator.co

Think about the domain of the function EDIT: Someone already provided the answer here https://news.ycombinator.com/item?id=30146426 https://news.ycombinator.com/item?id=30146426