Click the thumbnails to enlarge.

Example 1 (Figures 13.2.1, 13.2.2, 13.2.3 and 13.2.4)

Example 2 (Figures 13.2.5 and13.2.6)

Example 3 (Figure 13.2.7)

Example 4 (Figure 13.2.8)

Example 5 (Figures 13.2.9, 13.2.10 and 13.2.11)

Example 6 (Figure 13.2.12 and 13.2.13)

Exercise 9 (Figures 13.2.14 and 13.2.15)

Exercises 10 and 11 (Figures 13.2.16 and 13.2.17)

Exercises 12 and 13 (Figures 13.2.18 and 13.2.19)

Exercise 15 (Figure 13.2.20)

Exercise 16 (Figures 13.2.21 and 13.2.22)

Exercise 17 (Figure 13.2.23)