Hi. I answered this question but I have no idea if I did it correctly...
Question: Find a that fulfills: if , then
That part was easy, now is the part I don't know if I did logically/correctly...
The function is not defined at so we can require (so the x can stay away from )
So now we get
and since ,
Therefore if we require , we will for sure get for
**edit thanks for your advice!