A continuous function $\"\"$ has a relative minimum at $\"\"$ and is increasing as $\"\"$ increses from $\"\"$ .

The function $\"\"$ as $\"\"$ increses to $\"\"$ .

Because $\"\"$ represents relative minimum, by definition $\"\"$ , where $\"\"$ is slightly less than $\"\"$ , must be greater than $\"\"$ . Therefore, as $\"\"$ increses from $\"\"$ to $\"\"$ , the function is decreasing.