Euler: Error of 0.0017828128093108954 in 4001 steps.
RK4: Error of 1.6399864728279775e-19 in 4001 steps.
Adaptive RK4: Error of 7.496803458130451e-07 in 45 steps.
RK-Fehlberg: Error of 7.835831771324868e-05 in 45 steps.