(a)

The function is $\"\"$ .

Graph :

Graph the function $\"\"$ :

$\"\"$

Observe the graph.

As $\"\"$ tends to $\"\"$ from left hand side, the value of $\"\"$ approaches to $\"\"$ .

So $\"\"$ .

As $\"\"$ tends to $\"\"$ from right hand side, the value of $\"\"$ approaches to $\"\"$ .

So $\"\"$ .

Left hand limit and right hand limit are equal, so $\"\"$ is exist.

Therefore $\"\"$ .

(b)

The function is $\"\"$ .

Construct the table with nearest value of $\"\"$ , to estimate the value of $\"\"$ :

\ \

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

Observe the table.

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

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

$\"\"$ .

$\"\"$

$\"\"$ .