Hi all,

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.

Thanks.