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)

$\"\"$ ; $\"\"$ .