Update app.py

app.py

@@ -20,7 +20,7 @@ def calculator_tool(expression: str)-> str: # Returns a string result
     """
     try:
         api_url = "https://mathsolver.microsoft.com/en/solve-problem/A%20p%20i"
-        response = requests.post((api_url, json={"expr": expression}))
+        response = requests.post(api_url, json={"expr": expression})
 
         if response.status_code == 200:
             return f"Result: {response.json()}"