Program:	QUADAPP
Author:	Dave Gaebler
February 19, 1999

Variables used:Y1,Y2,Str1,A,B,C,D,X
This program finds the quadratic approximation to a function f(x) at a point a.  The quadratic approximation at a is f(a)+f'(a)(x-a)+f''(a)(x-a)^2/2.  It is the parabola whose value, first derivative, and second derivative at a are all the same as f(x).  Enter Y1 WITHOUT QUOTES!  Then enter the point a.  After a brief think, the graph will be displayed.  You can change the window as much as you like; Y2 is the parabola that approximates Y1.  The coefficients of this parabola are c/2, b-ac, and d-ab+1/2a^2.