9 (b).  Explain why, in Inequality (4-17) ,     and  .  

Solution 9 (b).

See text and/or instructor's solution manual.

Solution.  As mentioned in the proof:  Let  .  Choose    so that  .  

Since    we see that   .

As mentioned in the proof:  Choose    to be small enough so that  .

Since    and    we see that   .

This solution is complements of the authors.

(c) 2008 John H. Mathews, Russell W. Howell