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Trigonometry Fundamentals: Ratios, Identities & Proofs › Trigonometric Ratios

Trig Identities Cheat Sheet

Step 2 of 4 • ⏱️ 5 min • ⚡ 15 XP
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Common Exam Traps

> **Exam Trap:** `tan 90°` is **undefined**, not 0. Also, never write sin²θ as (sin θ)² — use the correct notation.
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