Observe the graph :

(a)

The function $\"\"$ on the interval $\"\"$ .

The solution of $\"\"$ in set notation is $\"\"$ .

(b)

The function $\"\"$ on the interval $\"\"$ .

The solution of $\"\"$ in set notation is $\"\"$ .

$\"\"$

(a) $\"\"$ ; $\"\"$ .

(b) $\"\"$ ; $\"\"$ .