$Error=\left|Exact4-u\right|$

$u={\text{e}}^x-\frac{1}{144}{\text{e}}^2+1.051185675$

$Exact4=1+{\text{e}}^x$

x

0.0001272

2.1050437

2.1051709

0.1

0.0001272

2.2212755

2.2214028

0.2

0.0001272

2.3497316

2.3498588

0.3

0.0001272

2.4916975

2.4918247

0.4

0.0001272

2.6485941

2.6487213

0.5

0.0001272

2.8219916

2.8221188

0.6

0.0001272

3.0136255

3.0137527

0.7

0.0001272

3.2254137

3.2255409

0.8

0.0001272

3.4594759

3.4596031

0.9

0.0001272

3.7181546

3.7182818

1.0