Given:
The graph of a function .
To find:
The interval where .
Solution:
From the given graph graph it is clear that, the function before x=0 and after x=3.6 lies above the x-axis. So, for and .
The function between x=0 and x=3.6 lies below the x-axis. So, for .
Now,
For , the graph of h(x) is above the x-axis. So, .
For , the graph of h(x) is below the x-axis. So, .
For , the graph of h(x) is below the x-axis. So, .
Only for the interval , we get .
Therefore, the correct option is A.