Let $f$ be the function whose graph is given below.

(a). Use this graph to find the largest number $\delta > 0$ such that (Enter dne if no such $\delta$ exists.)

$\delta =$

(b). Use the graph to find the largest number $\delta > 0$ such that (Enter dne if no such $\delta$ exists.)

$\delta =$

You can earn partial credit on this problem.