Upload app.py

app.py

@@ -1326,7 +1326,10 @@ def ask_ai(problem: str, sympy_info: dict, history: list) -> str:
         "6. End EVERY solution with:\n"
         "   ✅ **Final Answer:** $$your_answer$$\n"
         "7. NEVER make arithmetic errors.\n"
-        "8. Keep explanations concise — one sentence per step.\n\n"
+        "8. Keep explanations concise — one sentence per step.\n"
+        "9. NEVER use \\begin{vmatrix}, \\begin{matrix}, \\begin{pmatrix} or any LaTeX matrix environments.\n"
+        "   Instead write cross products as: i(a2b3-a3b2) - j(a1b3-a3b1) + k(a1b2-a2b1)\n"
+        "10. NEVER use \\begin{} or \\end{} LaTeX environments — Streamlit cannot render them.\n\n"
         "=== ODE RULES (follow exactly) ===\n"
         "For ANY Ordinary Differential Equation:\n"
         "A. Always find complementary function (CF) by solving auxiliary equation first.\n"