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sympy__sympy-12236

Based on my knowledge of sympy and the issue description, I can create the patch. The problem is in the apart function in sympy/polys/partfrac.py. When polynomial division is performed with a polynomial ring domain like ZZ[y], fractional…

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Content

Based on my knowledge of sympy and the issue description, I can create the patch. The problem is in the `apart` function in `sympy/polys/partfrac.py`. When polynomial division is performed with a polynomial ring domain like `ZZ[y]`, fractional coefficients get truncated to zero. The fix is to convert the domain to its field of fractions before performing division.

Looking at the issue details:
1. The `apart` function calls `P.div(Q, auto=True)` 
2. When the domain is `ZZ[y]`, division that produces fractional coefficients fails
3. The `auto=True` flag should handle this, but it doesn't work c

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