Create app.py

app.py

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+import streamlit as st
+
+st.set_page_config(page_title="Scientific Calculator", layout="centered")
+
+st.title("🧮 Scientific Calculator")
+
+# Input expression
+expression = st.text_input("Enter a mathematical expression (e.g., 2*(3+4) / sin(45)):")
+
+# Instructions
+with st.expander("📘 Instructions"):
+    st.markdown("""
+    You can use the following operations and functions:
+    
+    - Basic arithmetic: `+`, `-`, `*`, `/`, `**` (power)
+    - Trigonometric: `sin(x)`, `cos(x)`, `tan(x)` (in degrees)
+    - Logarithms: `log(x)` (natural), `log10(x)`
+    - Square root: `sqrt(x)`
+    - Constants: `pi`, `e`
+    """)
+
+# Evaluator
+import math
+import numpy as np
+
+safe_dict = {
+    "sin": lambda x: math.sin(math.radians(x)),
+    "cos": lambda x: math.cos(math.radians(x)),
+    "tan": lambda x: math.tan(math.radians(x)),
+    "sqrt": math.sqrt,
+    "log": math.log,
+    "log10": math.log10,
+    "pi": math.pi,
+    "e": math.e,
+    "__builtins__": {}
+}
+
+if expression:
+    try:
+        result = eval(expression, {"__builtins__": {}}, safe_dict)
+        st.success(f"Result: `{result}`")
+    except Exception as e:
+        st.error(f"Error: {e}")