Update app.py

app.py

@@ -43,7 +43,9 @@ def calculate_derivative(func_str):
         func = sp.sympify(func_str)
         # Calculate the derivative
         derivative = sp.diff(func, x) 
-        return func, derivative
+        func_lambdified = sp.lambdify(x, func, "numpy")
+        derivative_lambdified = sp.lambdify(x, derivative, "numpy")
+        return func_lambdified, derivative_lambdified
     except sp.SympifyError:
         st.error("Invalid function input. Please enter a valid mathematical expression.")
         return None, None