(a)
\Consider the function as .
.
does not exist.
The limit does not exist at .
(b)
\The graph of the function has a hole at .
The function is not defined at .
(c)
\The is exists.
.
The limit exists but it is not equal to the value of the function at .
(d)
\.
The does not exist.
The limit does not exist at .
(a) The limit does not exist at .
(b) The function is not defined at .
(c) The limit exists but it is not equal to the value of the function at .
(d) The limit does not exist at .