Trigonometry

Trigonometry starts with the definitions of sine, cosine and tangent and grows into identities, reduction formulae, general solutions, and the sine, cosine and area rules for solving triangles in 2D and 3D. It carries some of the heaviest mark allocations in Paper 2, and it rewards memory plus pattern recognition: keep a single summary page of identities and special angles, revise it weekly, and practise recognising which identity a question is really asking for.