Answer
See the explanation below.
Work Step by Step
Suppose a function is considered to be written as $f(x,y)$ with two variables $x,y$ in a set of domain D of real numbers that approaches the point $(a,b)$ along any closed path which lies inside the domain.
To show that the limit for such a function does not exist, we will have to two different paths that approaches the point $(a,b)$ with different limits.
