The function is .
The condition is :
\If then
.
Find the value of .
definition of limit :
.
if for every number of , there exists a
such that
whenever
.
Compare the condition, if then
with the
definition of limit.
Here ,
and
.
Observe the graph.
\.
Consider .
The function lies in the interval .
\
Consider .
.
The function lies in the interval .
Compare with
.
Here value should be a smaller positive number.
Therefore .
\
.