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🔍 PREVIEW MODE – Only you can see this. Back to Admin EduTek Lesson Notes Shop Print PDF Home › SS › Mathematics › Sine and Cosine Rules SS 2 Sine and Cosine Rules Mathematics SS 2 Second Term Introduction to Sine and Cosine Rules The Sine Rule and Cosine Rule are used to solve non-right-angled triangles (oblique triangles). These rules are essential tools in trigonometry for finding unknown sides and angles. 📌 Key Concepts: In any triangle ABC, the sides are denoted by a (opposite angle A), b ( [Preview only]