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sympy__sympy-19487

Based on my knowledge of the sympy codebase and the issue description, I can provide the patch to add the _eval_rewrite_as_Abs method to the sign class. The issue asks for sign(x).rewrite(Abs) to return a Piecewise expression that handles…

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Content

Based on my knowledge of the sympy codebase and the issue description, I can provide the patch to add the `_eval_rewrite_as_Abs` method to the `sign` class. The issue asks for `sign(x).rewrite(Abs)` to return a `Piecewise` expression that handles the zero case properly.

Let me create the patch based on the standard sympy code structure:

--- a/sympy/functions/elementary/complexes.py
+++ b/sympy/functions/elementary/complexes.py
@@ -9,6 +9,7 @@
 from sympy.core.logic import fuzzy_bool, fuzzy_not
 from sympy.core.mul import Mul
 from sympy.core.relational import Eq
+from sympy.functions.element

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