Flashcards for Edexcel A Level Maths Trigonometric Ratios, covering the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3. 3 cards drawn from 9.1 The Cosine Rule, 9.2 The Sine Rule, 9.3 Areas of Triangles, 9.4 Solving Triangle Problems, 9.5 Graphs of Sine, Cosine and Tangent, and 9.6 Transforming Trigonometric Graphs, matched to the Edexcel A Level Maths (9MA0) specification. Recall questions account for roughly 50% of marks at A Level Maths, so these target the marks you can secure before the paper starts.