Create app.py

app.py

@@ -0,0 +1,61 @@
+import streamlit as st
+from sympy import symbols, integrate, diff, latex
+
+# Define the Streamlit app
+def main():
+    st.title("Integration by Parts - Step-by-Step Solver")
+    st.markdown(
+        """
+        Integration by Parts formula:
+        \
+        \\int u \\cdot v' \\, dx = u \\cdot v - \\int v \\cdot u' \\, dx
+        \
+        """
+    )
+
+    # Input section
+    st.header("Input Function")
+    function_input = st.text_input(
+        "Enter the integrand (e.g., x * exp(x) or ln(x)):", "x * exp(x)"
+    )
+    u_input = st.text_input(
+        "Choose 'u' (e.g., x for x * exp(x)):",
+        "x"
+    )
+
+    # Process inputs
+    if st.button("Solve"):
+        try:
+            x = symbols("x")
+            # Parse the integrand and chosen `u`
+            integrand = eval(function_input)
+            u = eval(u_input)
+            dv = integrand / u
+
+            # Compute derivatives and integrals
+            du = diff(u, x)
+            v = integrate(dv, x)
+
+            # Apply the formula
+            result = u * v - integrate(v * du, x)
+
+            # Display steps
+            st.subheader("Step-by-Step Solution")
+            st.latex(f"u = {latex(u)}, \\quad v' = {latex(dv)}")
+            st.latex(f"du = {latex(du)}, \\quad v = \\int {latex(dv)} \\, dx = {latex(v)}")
+            st.markdown("Substituting into the formula:")
+            st.latex(
+                f"\\int {latex(integrand)} \\, dx = {latex(u)} \\cdot {latex(v)} - \\int {latex(v)} \\cdot {latex(du)} \\, dx"
+            )
+            st.latex(f"= {latex(result)} + C")
+
+            # Final output
+            st.subheader("Final Answer")
+            st.latex(f"{latex(result)} + C")
+
+        except Exception as e:
+            st.error(f"An error occurred: {e}")
+
+# Run the app
+if __name__ == "__main__":
+    main()