Observe the graph :

The function is $\"\"$ .

$\"\"$ is constant on $\"\"$ , increasing on $\"\"$ , and decreasing on $\"\"$ .

Support numerically :

Construct the table by using the values of $\"\"$ in each interval.

The interval $\"\"$ :

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

Observe the above table, $\"\"$ is constant on $\"\"$ .

The interval $\"\"$ :

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

Observe the above table, $\"\"$ is increasing on $\"\"$ .

The interval $\"\"$ :

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

Observe the above table, $\"\"$ is dereasing on $\"\"$ .

$\"\"$ is constant on $\"\"$ , increasing on $\"\"$ , and decreasing on $\"\"$ .