Table 2: The maximum absolute error as reported in [28] is , while in our case, it is .

Exact sol. OHAM sol. (3.10) (3.10) −1.0 0.540302306 0.540302301 −0.8 0.195077879 0.195077879 −0.6 −0.231093972 −0.231094010 −0.4 −0.626321476 −0.626321543 −0.2 −0.901661252 −0.901661334 0.0 −1.000000000 −1.000000086 0.2 −0.901661252 −0.901661334 0.4 −0.626321476 −0.626321543 0.6 −0.231093972 −0.231094010 0.8 0.195077879 0.195077879 1.0 0.540302306 0.540302301

= exact − approximate.