Proving the Non-Existence of the Limit of Cos(1/x) Using Delta and Epsilon

[highshorty]

I need help with proving lim x -> 0 f(x) = cos(1/x) does not exist.
Using specifically delta and epsilon

 

[Mark44]

The rules of this forum state that before we can give you any help, you need to have shown some effort at solving the problem.