Update app.py

app.py

@@ -435,6 +435,7 @@ STRICT REQUIREMENTS:
    - Use Abs() for absolute value (not abs())
    - Define functions using Function() class when needed
    - Include print statements for ALL calculations and results
+   - Use simple print statements instead of f-strings for SymPy expressions
    - Print intermediate steps and final answers
    - Print variable values after they are computed
    - Print expressions with labels on separate lines: