Update llm_utils.py

llm_utils.py

@@ -56,7 +56,13 @@ def explain_with_llm(solution_text, equation_type, llm_url, yaml_path="theorems.
         )
 
         if response.status_code == 200:
-            return response.json().get("explanation", "❌ No explanation returned.")
+            res_json = response.json()
+            if isinstance(res_json, dict):
+                return res_json.get("explanation", "❌ No explanation returned.")
+            elif isinstance(res_json, list) and len(res_json) > 0:
+                return res_json[0]
+            else:
+                return "❌ LLM response was empty or invalid."
         else:
             return f"❌ LLM request failed: {response.status_code}"