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8
7
6
5
4
3
2
1
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
t
Fig. 5.3
An oscillating function y
D
y.t/ and a linear approximation p
D
p.t/
30
25
20
15
10
5
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
t
Fig. 5.4
An oscillating function y
D
y.t/ and a quadratic approximation p
D
p.t/
