X

Exact solution

Approximate solution

Approximate solution

−1

0.36787944

0.367966169

8.6729 × 10⁻⁵

−0.8

0.44932896

0.449409094

8.0134 × 10⁻⁵

−0.6

0.54881164

0.548889417

7.7837 × 10⁻⁵

−0.4

0.67032005

0.676389371

6.9321 × 10⁻⁵

−0.2

0.81873075

0.818758949

7.8199 × 10⁻⁵

0

1.00000000

1.000966532

7.6653 × 10⁻⁴

0.2

1.22140283

1.222229894

8.9614 × 10⁻⁴

0.4

1.47182472

1.472514031

6.8933 × 10⁻⁴

0.6

1.82211881

1.822781972

5.9397 × 10⁻⁴

0.8

2.22551000

2.226029824

4.8892 × 10⁻⁴

1.0

2.71828182

2.718738011

4.5621 × 10⁻⁴