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Hi,
To import a function you need to use a syntax like
from the_module import my_function
in your case it will be
from sage.gsl.integration import numerical_integral
To find out where is what, there is a magic function in Sage
sage: import_statements(numerical_integral)
from sage.gsl.integration import numerical_integral
(Note that the code you wrote won't run faster with cython: the function call will be in Cython but what is inside numerical_integral won't be different from a python call).
