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In order to use SymPy's fresnelc and fresnels functions in Sage, one should import them.

This is done as follows.

sage: from sympy import fresnelc, fresnels

Then one can do for instance

sage: fresnels(x)
sage: integrate(fresnels(x), (x, 0, 1))
-1/pi + fresnel_sin(1)

The above is run using Sage 8.3.rc3.

sage: version()
'SageMath version 8.3.rc3, Release Date: 2018-07-28'