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This is one of the problems you're having:
sage: ff(scipy.array([1,1]))
TypeError: no canonical coercion from <type 'numpy.int64'> to Symbolic Ring
Which can be remedied as such:
sage: ff(scipy.array([1.,1.]))
2
But this merely exposes another problem:
sage: scipy.optimize.fsolve(ff, scipy.array([1.,1.]))
TypeError: There is a mismatch between the input and output shape of ff.
And I don't know how to solve that one.
