Update app.py

app.py

@@ -94,6 +94,18 @@ col1, col2 = st.columns([1, 2])
 with col1:
     st.subheader("🔧 Define Your Function")
     
+    # Instructional message for function input
+    st.markdown(
+        """
+        **How to input your function:**
+        - Use `x` for the variable.
+        - Example: For \(x^2\), input `x**2`.
+        - For sine function, input `np.sin(x)`.
+        - For logarithm, input `np.log(x)`.
+        - For other mathematical operations, use `np` (e.g., `np.exp(x)`).
+        """
+    )
+
     # Use text input for the user to define a function
     func_input = st.text_input(
         "Enter a function of 'x':",