Here is a worked example for a possibly different function:

Use the following intervals for the average rates of change:
h = 1:     Interval: [1, 2]
R(2) - R(1)

2 - 1
= 200
h = 0.1:     Interval: [1, 1.1]
R(1.1) - R(1)

1.1 - 1
= 290
h = 0.01:     Interval: [1, 1.01]
R(1.01) - R(1)

1.01 - 1
= 299
h = 0.001:     Interval: [1, 1.001]
R(1.001) - R(1)

1.001 - 1
= 299.9
h = 0.0001:     Interval: [1, 1.0001]
R(1.0001) - R(1)

1.0001 - 1
= 299.99

We therefore get the following table:

 


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