```
In [0]: classify_ode(Eq(2*x**3*f(x).diff(x), 0), f(x))

Out[0]: (separable, 1st_linear, 1st_power_series, lie_group, separable_Integral, 1st_linear_Integral)
In [1]: classify_ode(Eq(2*f(x)**3*f(x).diff(x), 0), f(x))

Out[1]: (separable, 1st_power_series, lie_group, separable_Integral)
```