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Table 1 Comparison between approximation formulas (3.5) and (3.6).

From: Approximations to inverse tangent function

n

\(a_{n}-\frac{\arctan n}{n}\)

\(\frac{\arctan n}{n}-b_{n}\)

1

7.055 × 10−3

5.259 × 10−3

10

5.95 × 10−6

3.939 × 10−7

100

7.066 × 10−10

4.492 × 10−12

1000

7.182 × 10−14

4.546 × 10−17

10,000

7.193 × 10−18

4.552 × 10−22