*  Reading Outline, Sec3.9 *
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* Vocabulary/Definitions *
 - Tangent line approximation
 - Local linearization
 - Error in the tangent line approximation
 - lim{x->a} E(x)/(x - a)
 - What E(x) is approximately equal to near x=a



* Understand *
1. What is the tangent line approximation to f(x) = cos(x) near
x=pi/3? 

2. Find a formula for the error E(x) in your approximation in (1).

3. For your E(x), fill in the following table:
    x                 E(x)/(x-pi/3)     E(x)\over (x-pi/3)^2
   (pi/3)+0.1 
   (pi/3)+0.01 
   (pi/3)+0.001 
   (pi/3)+0.0001 

How does this illustrate what you found in the Vocabulary/Definitions
section of this assignment?