hi, I'm trying to solve this ODE with the SymPy:

dsolve(Eq(Derivative(f(x), x), ((1+3 * x**2) / (3 * f(x) + 6))), f(x), 
ics={f(0):1})


and it it prints out


             _________________                _________________

            /         3                      /         3

          \/  C1 + 6*x  + 6*x              \/  C1 + 6*x  + 6*x

[f(x) = - -------------------- - 2, f(x) = -------------------- - 2]

                   3                                3

...it doesn't eliminate the constant C1, it doesn't use the initial 
condition. Is it a bug or wrong usage?

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