$\"\"$

The function is $\"\"$ .

Estimate the value of $\"\"$ , construct a table with nearest values of $\"\"$ .

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

\ $\"\"$ \	\ $\"\"$ \	\ $\"\"$ \	\ $\"\"$ \	\ $\"\"$ \	\ $\"\"$ \	\ $\"\"$ \
\ $\"\"$ \	\ $\"\"$ \	\ $\"\"$ \	\ $\"\"$ \	\ $\"\"$ \	\ $\"\"$ \	\ $\"\"$ \

Observe the table:

The value of $\"\"$ at $\"\"$ is $\"\"$ and the value of $\"\"$ at $\"\"$ is $\"\"$ .

Therefore the value of $\"\"$ at $\"\"$ is $\"\"$ .

$\"\"$

Graph the function:

$\"\"$

Observe the graph:

As $\"\"$ tends to $\"\"$ , $\"\"$ approaches to $\"\"$ .

$\"\"$

$\"\"$ .