Exercise 5.  Show that

5 (a).  .  

Solution 5 (a).

See text and/or instructor's solution manual.

Solution.  We can simplify as follows:

          

Aside.  If you forgot the tricky substitution  ,  it's o.k. to use the calculation  

          

And we find that

          

This solution is complements of the authors.

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