I've tried a lot of times, but I'm still stuck on
So far, I've done:
To show that exists for all
However, I can't use the normal triangle inequality here since there's a negative number inside.
I've also tried:
So the limit exists since always exists in that interval for all .
But that is not the epsilon delta proof I need.
Kindly advise. Need a hint or something. I'm brain dead. Lol.