Create limits.md

data/knowledge_base/limits.md

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+# Limits – Key Rules
+
+## Standard Limits
+lim (x → 0) sin x / x = 1  
+lim (x → 0) (1 − cos x) / x² = 1/2
+
+## Techniques
+- Factorization
+- Rationalization
+- Standard identities
+
+## Infinite Limits
+If f(x) → ∞ as x → a, limit diverges
+
+## Common Mistakes
+- Cancelling terms incorrectly
+- Ignoring domain restrictions