Maple examples from class, 6/7/05 -- CF Example 3, page 94
| > | f := x -> 2*x - 3*x^2; |
| > | plot(f, -1/10..3/4); |
| > | NQ := x -> ( f(-2+x) - f(-2) )/x; |
| > | NQ(t); |
| > | Narrow := -1..1; |
| > | Narrower := -1/100..1/100; |
| > | Narrowest := -1/100000..1/100000; |
| > | plot(NQ, Narrow); |
| > | plot(NQ, Narrower); |
| > | plot(NQ, Narrowest); |
| > | Really_Narrow := -1E-12..1E-12; |
| > | plot(NQ, Really_Narrow); |
| > |
| > |