Solutions of Triangles | Trigonometry Sine Formula: In any triangle ABC, Cosine Formula: (i) or a² = b² + c² − 2bc. cos A (ii) (iii) Projection Formula: (i) a = b cos C + c cos B (ii) b = c cos A + a cos C (iii) c = a cos B + b cos A Napier’S Analogy − Tangent Rule: (i) (ii) (iii) Trigonometric Functions Of Half Angles: (i) (ii) (iii) … [Read more...]