This is a problem from Introduction to Analysis by Arthur P. Mattuck,chapter 20,problem 20-1.
<a href="http://www.flickr.com/photos/86024731@N04/8090259684/" [Broken] title="arctangent by gnu is not unix, on Flickr"><img src="http://farm9.staticflickr.com/8193/8090259684_a5ce06801e.jpg" width="500" height="325" alt="arctangent"></a>
I have worked out question (a),(b),(c),but I am stucked in question (d).
The Attempt at a Solution
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