$\"\"$

Observe the graph :

(a)

The graph is increasing over $\"\"$ and $\"\"$ .

The largest interval on which $\"\"$ is increasing is $\"\"$ .

$\"\"$

(b)

The graph is decreasing over $\"\"$ and $\"\"$ .

The largest interval on which $\"\"$ is decreasing is $\"\"$ .

$\"\"$

(a) $\"\"$ .

(b) $\"\"$ .