An Elementary Solution to a Duffing Equation

Table 2

Errors for approximations (52) and (53).

0	0	0
0.05	8.066e-9	6.548e-9
0.1	1.4551e-7	1.158e-7
0.15	8035e-7	6.51e-7
0.2	3.0125e-6	2.23e-6
0.25	8.45e-6	6.29e-6
0.3	0.00002	0.000015
0.35	0.00004	0.000031
0.4	0.000089	0.000061
0.45	0.00017	0.00011
0.5	0.00032	0.00021
0.55	0.00058	0.00037
0.6	0.0011	0.00065
0.65	0.0019	0.0012
0.7	0.0036	0.0021
0.75	0.0071	0.0039
0.8	0.0146	0.0079
0.85	0.0327	0.0173
0.9	0.0832	0.043
0.95	0.265	0.136