Update app.py

app.py

@@ -243,6 +243,7 @@ def assess_drug_likeness(df: pd.DataFrame):
 
 def plot_properties_dashboard(df: pd.DataFrame):
     """Creates a professional 2x2 dashboard of molecular property visualizations using Bokeh."""
+    from math import pi, cos, sin
     if df.empty or 'Drug_Like' not in df.columns:
         return None, "Cannot plot: No analysis data or 'Drug_Like' column missing."