$\"\"$

Observe the graph: The $\"\"$ graph is positive on $\"\"$ and negative on $\"\"$ .

If $\"\"$ is positive on $\"\"$ , then $\"\"$ is increasing over $\"\"$ .

If $\"\"$ is negative on $\"\"$ , then $\"\"$ is decreasing over $\"\"$ .

$\"\"$ has relative minimum at $\"\"$ .

Therefore $\"\"$ is

Graph:

$\"\"$