Exercises 20, 21

Vasco,

Here are my takes on Chapter 4, Exercises 20 and 21. Twenty is much like your answer and derivative in parts. Twenty-one is an ongoing adventure.

Gary

Answers to Ex. 21 (iii, iv) rewritten Dec 3.  They are also posted at:

faculty.unlv.edu/gbp/mma/VisualComplexAnalysis/