Upload app.py

app.py

@@ -994,9 +994,14 @@ def run_sympy(problem: str) -> dict:
 
                 # ── Series sum ────────────────────────────────────────────
                 elif any(k in p for k in ["series","sum of"]):
-                    m = re.search(r"(?:sum|series)\s+(?:of\s+)?(.+?)\s*(?:from|$)", p)
+                    m = re.search(r"(?:sum\s+of|series\s+(?:of\s+)?|convergence\s+of)\s*(.+?)(?:\s+from|\s+using|\s+by|$)", p)
                     if m:
-                        raw = clean(m.group(1))
+                        raw = m.group(1).strip()
+                        raw = re.sub(r"^series\s+sum\s+of\s+", "", raw)
+                        raw = re.sub(r"^series\s+of\s+", "", raw)
+                        raw = re.sub(r"^sum\s+of\s+", "", raw)
+                        raw = re.sub(r"^of\s+", "", raw)
+                        raw = clean(raw)
                         try:
                             expr_ser = parse_expr(raw, transformations=tfms,
                                                   local_dict={**ld, "n": n_s})
@@ -1247,13 +1252,34 @@ def ask_ai(problem: str, sympy_info: dict, history: list) -> str:
         user_msg = problem
     messages.append({"role": "user", "content": user_msg})
 
+    # ── Permanent fix: force correct final answer from SymPy ────────
+    def enforce_verified_answer(ai_response: str) -> str:
+        """Remove AI final answer, replace with SymPy verified one."""
+        result = sympy_info.get("result", "")
+        latex  = sympy_info.get("latex", "")
+        # Only enforce if SymPy has a real computed result
+        if (not result or
+                result in (None, "matrix_detected", "mod_detected") or
+                not latex):
+            return ai_response  # theory question — leave AI response untouched
+        # Remove everything after last "✅" or "Final Answer"
+        cleaned = re.sub(
+            r'(✅\s*\*{0,2}Final\s*Answer\*{0,2}.*|✅[^\n]*$)',
+            "", ai_response,
+            flags=re.DOTALL | re.IGNORECASE
+        ).rstrip()
+        # Append our verified final answer
+        verified_line = f"\n\n✅ **Final Answer:** $${latex}$$"
+        return cleaned + verified_line
+
     # Try each provider in order — auto-rotate on 429 or error
     last_error = ""
     for provider_name, key, call_fn in providers:
         if not key:
             continue  # skip if key not set
         try:
-            return call_fn(key, messages)
+            response = call_fn(key, messages)
+            return enforce_verified_answer(response)
         except requests.exceptions.Timeout:
             last_error = f"⏳ {provider_name} timed out"
             continue